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Finding the Fourth Proportional to 71,963.88, 99,307.72 and 39,699.78

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Solution

The fourth proportional to 71,963.88, 99,307.72 and 39,699.78 is: 54,784.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,963.88 : 99,307.72 = 39,699.78 : x
  2. Step 2: Convert to fraction form
    71,963.88/99,307.72 = 39,699.78/x
  3. Step 3: Cross multiply
    71,963.88x = 99,307.72 × 39,699.78
  4. Step 4: Simplify right side
    71,963.88x = 3,942,494,636.30
  5. Step 5: Solve for x
    x = 3,942,494,636.30/71,963.88
  6. Step 6: Final answer
    x = 54,784.35

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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.