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Finding the Fourth Proportional to 138,345.03, 207,118.42 and 81,245.90

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Solution

The fourth proportional to 138,345.03, 207,118.42 and 81,245.90 is: 121,634.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,345.03 : 207,118.42 = 81,245.90 : x
  2. Step 2: Convert to fraction form
    138,345.03/207,118.42 = 81,245.90/x
  3. Step 3: Cross multiply
    138,345.03x = 207,118.42 × 81,245.90
  4. Step 4: Simplify right side
    138,345.03x = 16,827,522,754.16
  5. Step 5: Solve for x
    x = 16,827,522,754.16/138,345.03
  6. Step 6: Final answer
    x = 121,634.46

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.