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Finding the Fourth Proportional to 138,648.48, 207,990 and 45,129.12

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Solution

The fourth proportional to 138,648.48, 207,990 and 45,129.12 is: 67,699.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,648.48 : 207,990 = 45,129.12 : x
  2. Step 2: Convert to fraction form
    138,648.48/207,990 = 45,129.12/x
  3. Step 3: Cross multiply
    138,648.48x = 207,990 × 45,129.12
  4. Step 4: Simplify right side
    138,648.48x = 9,386,405,668.80
  5. Step 5: Solve for x
    x = 9,386,405,668.80/138,648.48
  6. Step 6: Final answer
    x = 67,699.30

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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.