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Finding the Fourth Proportional to 520,103.80, 780,155.70 and 425,625.40

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Solution

The fourth proportional to 520,103.80, 780,155.70 and 425,625.40 is: 638,438.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,103.80 : 780,155.70 = 425,625.40 : x
  2. Step 2: Convert to fraction form
    520,103.80/780,155.70 = 425,625.40/x
  3. Step 3: Cross multiply
    520,103.80x = 780,155.70 × 425,625.40
  4. Step 4: Simplify right side
    520,103.80x = 332,054,081,874.78
  5. Step 5: Solve for x
    x = 332,054,081,874.78/520,103.80
  6. Step 6: Final answer
    x = 638,438.10

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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.