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Finding the Fourth Proportional to 159,387.12, 219,935.10 and 91,400.60

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Solution

The fourth proportional to 159,387.12, 219,935.10 and 91,400.60 is: 126,121.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    159,387.12 : 219,935.10 = 91,400.60 : x
  2. Step 2: Convert to fraction form
    159,387.12/219,935.10 = 91,400.60/x
  3. Step 3: Cross multiply
    159,387.12x = 219,935.10 × 91,400.60
  4. Step 4: Simplify right side
    159,387.12x = 20,102,200,101.06
  5. Step 5: Solve for x
    x = 20,102,200,101.06/159,387.12
  6. Step 6: Final answer
    x = 126,121.86

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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.