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Finding the Fourth Proportional to 128,502.72, 177,332.49 and 71,914.50

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Solution

The fourth proportional to 128,502.72, 177,332.49 and 71,914.50 is: 99,241.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,502.72 : 177,332.49 = 71,914.50 : x
  2. Step 2: Convert to fraction form
    128,502.72/177,332.49 = 71,914.50/x
  3. Step 3: Cross multiply
    128,502.72x = 177,332.49 × 71,914.50
  4. Step 4: Simplify right side
    128,502.72x = 12,752,777,352.11
  5. Step 5: Solve for x
    x = 12,752,777,352.11/128,502.72
  6. Step 6: Final answer
    x = 99,241.30

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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.