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Finding the Fourth Proportional to 128,512.80, 177,347.64 and 71,924.17

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Solution

The fourth proportional to 128,512.80, 177,347.64 and 71,924.17 is: 99,255.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,512.80 : 177,347.64 = 71,924.17 : x
  2. Step 2: Convert to fraction form
    128,512.80/177,347.64 = 71,924.17/x
  3. Step 3: Cross multiply
    128,512.80x = 177,347.64 × 71,924.17
  4. Step 4: Simplify right side
    128,512.80x = 12,755,581,808.46
  5. Step 5: Solve for x
    x = 12,755,581,808.46/128,512.80
  6. Step 6: Final answer
    x = 99,255.34

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1.5x scale

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.