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Finding the Fourth Proportional to 217,147.80, 325,721.70 and 138,610.20

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Solution

The fourth proportional to 217,147.80, 325,721.70 and 138,610.20 is: 207,915.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    217,147.80 : 325,721.70 = 138,610.20 : x
  2. Step 2: Convert to fraction form
    217,147.80/325,721.70 = 138,610.20/x
  3. Step 3: Cross multiply
    217,147.80x = 325,721.70 × 138,610.20
  4. Step 4: Simplify right side
    217,147.80x = 45,148,349,981.34
  5. Step 5: Solve for x
    x = 45,148,349,981.34/217,147.80
  6. Step 6: Final answer
    x = 207,915.30

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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.