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Finding the Fourth Proportional to 71,520.78, 98,699.40 and 39,689.94

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Solution

The fourth proportional to 71,520.78, 98,699.40 and 39,689.94 is: 54,772.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,520.78 : 98,699.40 = 39,689.94 : x
  2. Step 2: Convert to fraction form
    71,520.78/98,699.40 = 39,689.94/x
  3. Step 3: Cross multiply
    71,520.78x = 98,699.40 × 39,689.94
  4. Step 4: Simplify right side
    71,520.78x = 3,917,373,264.04
  5. Step 5: Solve for x
    x = 3,917,373,264.04/71,520.78
  6. Step 6: Final answer
    x = 54,772.52

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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.