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Finding the Fourth Proportional to 71,721.12, 98,963.12 and 39,885.76

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Solution

The fourth proportional to 71,721.12, 98,963.12 and 39,885.76 is: 55,035.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,721.12 : 98,963.12 = 39,885.76 : x
  2. Step 2: Convert to fraction form
    71,721.12/98,963.12 = 39,885.76/x
  3. Step 3: Cross multiply
    71,721.12x = 98,963.12 × 39,885.76
  4. Step 4: Simplify right side
    71,721.12x = 3,947,219,253.17
  5. Step 5: Solve for x
    x = 3,947,219,253.17/71,721.12
  6. Step 6: Final answer
    x = 55,035.66

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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.