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Finding the Fourth Proportional to 128,431.22, 177,241.97 and 71,839.22

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Solution

The fourth proportional to 128,431.22, 177,241.97 and 71,839.22 is: 99,141.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,431.22 : 177,241.97 = 71,839.22 : x
  2. Step 2: Convert to fraction form
    128,431.22/177,241.97 = 71,839.22/x
  3. Step 3: Cross multiply
    128,431.22x = 177,241.97 × 71,839.22
  4. Step 4: Simplify right side
    128,431.22x = 12,732,924,876.06
  5. Step 5: Solve for x
    x = 12,732,924,876.06/128,431.22
  6. Step 6: Final answer
    x = 99,141.98

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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.