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Finding the Fourth Proportional to 138,472.56, 190,966.68 and 90,708.48

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Solution

The fourth proportional to 138,472.56, 190,966.68 and 90,708.48 is: 125,095.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,472.56 : 190,966.68 = 90,708.48 : x
  2. Step 2: Convert to fraction form
    138,472.56/190,966.68 = 90,708.48/x
  3. Step 3: Cross multiply
    138,472.56x = 190,966.68 × 90,708.48
  4. Step 4: Simplify right side
    138,472.56x = 17,322,297,273.45
  5. Step 5: Solve for x
    x = 17,322,297,273.45/138,472.56
  6. Step 6: Final answer
    x = 125,095.52

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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.