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Finding the Fourth Proportional to 129,252.85, 178,365.79 and 71,891.98

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Solution

The fourth proportional to 129,252.85, 178,365.79 and 71,891.98 is: 99,209.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,252.85 : 178,365.79 = 71,891.98 : x
  2. Step 2: Convert to fraction form
    129,252.85/178,365.79 = 71,891.98/x
  3. Step 3: Cross multiply
    129,252.85x = 178,365.79 × 71,891.98
  4. Step 4: Simplify right side
    129,252.85x = 12,823,069,807.36
  5. Step 5: Solve for x
    x = 12,823,069,807.36/129,252.85
  6. Step 6: Final answer
    x = 99,209.18

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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.