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Finding the Fourth Proportional to 128,459.71, 177,279.20 and 71,871.49

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Solution

The fourth proportional to 128,459.71, 177,279.20 and 71,871.49 is: 99,185.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,459.71 : 177,279.20 = 71,871.49 : x
  2. Step 2: Convert to fraction form
    128,459.71/177,279.20 = 71,871.49/x
  3. Step 3: Cross multiply
    128,459.71x = 177,279.20 × 71,871.49
  4. Step 4: Simplify right side
    128,459.71x = 12,741,320,250.01
  5. Step 5: Solve for x
    x = 12,741,320,250.01/128,459.71
  6. Step 6: Final answer
    x = 99,185.34

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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.