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Finding the Fourth Proportional to 520,110.30, 780,165.45 and 425,631.90

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Solution

The fourth proportional to 520,110.30, 780,165.45 and 425,631.90 is: 638,447.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,110.30 : 780,165.45 = 425,631.90 : x
  2. Step 2: Convert to fraction form
    520,110.30/780,165.45 = 425,631.90/x
  3. Step 3: Cross multiply
    520,110.30x = 780,165.45 × 425,631.90
  4. Step 4: Simplify right side
    520,110.30x = 332,063,302,797.86
  5. Step 5: Solve for x
    x = 332,063,302,797.86/520,110.30
  6. Step 6: Final answer
    x = 638,447.85

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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.