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Finding the Fourth Proportional to 71,957.94, 99,302.39 and 40,128.85

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Solution

The fourth proportional to 71,957.94, 99,302.39 and 40,128.85 is: 55,378.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,957.94 : 99,302.39 = 40,128.85 : x
  2. Step 2: Convert to fraction form
    71,957.94/99,302.39 = 40,128.85/x
  3. Step 3: Cross multiply
    71,957.94x = 99,302.39 × 40,128.85
  4. Step 4: Simplify right side
    71,957.94x = 3,984,890,712.95
  5. Step 5: Solve for x
    x = 3,984,890,712.95/71,957.94
  6. Step 6: Final answer
    x = 55,378.05

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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.