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Finding the Fourth Proportional to 520,018.80, 780,028.20 and 425,540.40

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Solution

The fourth proportional to 520,018.80, 780,028.20 and 425,540.40 is: 638,310.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,018.80 : 780,028.20 = 425,540.40 : x
  2. Step 2: Convert to fraction form
    520,018.80/780,028.20 = 425,540.40/x
  3. Step 3: Cross multiply
    520,018.80x = 780,028.20 × 425,540.40
  4. Step 4: Simplify right side
    520,018.80x = 331,933,512,239.28
  5. Step 5: Solve for x
    x = 331,933,512,239.28/520,018.80
  6. Step 6: Final answer
    x = 638,310.60

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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.