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Finding the Fourth Proportional to 520,076.70, 780,115.05 and 253,878.30

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Solution

The fourth proportional to 520,076.70, 780,115.05 and 253,878.30 is: 380,817.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,076.70 : 780,115.05 = 253,878.30 : x
  2. Step 2: Convert to fraction form
    520,076.70/780,115.05 = 253,878.30/x
  3. Step 3: Cross multiply
    520,076.70x = 780,115.05 × 253,878.30
  4. Step 4: Simplify right side
    520,076.70x = 198,054,282,698.42
  5. Step 5: Solve for x
    x = 198,054,282,698.42/520,076.70
  6. Step 6: Final answer
    x = 380,817.45

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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.