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Finding the Fourth Proportional to 520,028.60, 780,042.90 and 253,959.80

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Solution

The fourth proportional to 520,028.60, 780,042.90 and 253,959.80 is: 380,939.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,028.60 : 780,042.90 = 253,959.80 : x
  2. Step 2: Convert to fraction form
    520,028.60/780,042.90 = 253,959.80/x
  3. Step 3: Cross multiply
    520,028.60x = 780,042.90 × 253,959.80
  4. Step 4: Simplify right side
    520,028.60x = 198,099,538,875.42
  5. Step 5: Solve for x
    x = 198,099,538,875.42/520,028.60
  6. Step 6: Final answer
    x = 380,939.70

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.