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Finding the Fourth Proportional to 138,417.80, 191,016.56 and 74,755.60

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Solution

The fourth proportional to 138,417.80, 191,016.56 and 74,755.60 is: 103,162.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,417.80 : 191,016.56 = 74,755.60 : x
  2. Step 2: Convert to fraction form
    138,417.80/191,016.56 = 74,755.60/x
  3. Step 3: Cross multiply
    138,417.80x = 191,016.56 × 74,755.60
  4. Step 4: Simplify right side
    138,417.80x = 14,279,557,552.74
  5. Step 5: Solve for x
    x = 14,279,557,552.74/138,417.80
  6. Step 6: Final answer
    x = 103,162.73

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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.