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Finding the Fourth Proportional to 61,902.77, 85,478.18 and 39,281.90

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Solution

The fourth proportional to 61,902.77, 85,478.18 and 39,281.90 is: 54,242.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,902.77 : 85,478.18 = 39,281.90 : x
  2. Step 2: Convert to fraction form
    61,902.77/85,478.18 = 39,281.90/x
  3. Step 3: Cross multiply
    61,902.77x = 85,478.18 × 39,281.90
  4. Step 4: Simplify right side
    61,902.77x = 3,357,744,695.14
  5. Step 5: Solve for x
    x = 3,357,744,695.14/61,902.77
  6. Step 6: Final answer
    x = 54,242.24

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.