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Finding the Fourth Proportional to 128,344.92, 177,044.90 and 74,624

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Solution

The fourth proportional to 128,344.92, 177,044.90 and 74,624 is: 102,939.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,344.92 : 177,044.90 = 74,624 : x
  2. Step 2: Convert to fraction form
    128,344.92/177,044.90 = 74,624/x
  3. Step 3: Cross multiply
    128,344.92x = 177,044.90 × 74,624
  4. Step 4: Simplify right side
    128,344.92x = 13,211,798,617.60
  5. Step 5: Solve for x
    x = 13,211,798,617.60/128,344.92
  6. Step 6: Final answer
    x = 102,939.79

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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.