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Finding the Fourth Proportional to 128,242.56, 176,974.72 and 71,655.68

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Solution

The fourth proportional to 128,242.56, 176,974.72 and 71,655.68 is: 98,884.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,242.56 : 176,974.72 = 71,655.68 : x
  2. Step 2: Convert to fraction form
    128,242.56/176,974.72 = 71,655.68/x
  3. Step 3: Cross multiply
    128,242.56x = 176,974.72 × 71,655.68
  4. Step 4: Simplify right side
    128,242.56x = 12,681,243,904.41
  5. Step 5: Solve for x
    x = 12,681,243,904.41/128,242.56
  6. Step 6: Final answer
    x = 98,884.83

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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.