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Finding the Fourth Proportional to 520,072.90, 780,109.35 and 485,080.90

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Solution

The fourth proportional to 520,072.90, 780,109.35 and 485,080.90 is: 727,621.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,072.90 : 780,109.35 = 485,080.90 : x
  2. Step 2: Convert to fraction form
    520,072.90/780,109.35 = 485,080.90/x
  3. Step 3: Cross multiply
    520,072.90x = 780,109.35 × 485,080.90
  4. Step 4: Simplify right side
    520,072.90x = 378,416,145,596.42
  5. Step 5: Solve for x
    x = 378,416,145,596.42/520,072.90
  6. Step 6: Final answer
    x = 727,621.35

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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.