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Finding the Fourth Proportional to 61,890.32, 85,396.20 and 38,020.88

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Solution

The fourth proportional to 61,890.32, 85,396.20 and 38,020.88 is: 52,461.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,890.32 : 85,396.20 = 38,020.88 : x
  2. Step 2: Convert to fraction form
    61,890.32/85,396.20 = 38,020.88/x
  3. Step 3: Cross multiply
    61,890.32x = 85,396.20 × 38,020.88
  4. Step 4: Simplify right side
    61,890.32x = 3,246,838,672.66
  5. Step 5: Solve for x
    x = 3,246,838,672.66/61,890.32
  6. Step 6: Final answer
    x = 52,461.17

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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.