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Finding the Fourth Proportional to 138,644.20, 207,966.30 and 45,159.40

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Solution

The fourth proportional to 138,644.20, 207,966.30 and 45,159.40 is: 67,739.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,644.20 : 207,966.30 = 45,159.40 : x
  2. Step 2: Convert to fraction form
    138,644.20/207,966.30 = 45,159.40/x
  3. Step 3: Cross multiply
    138,644.20x = 207,966.30 × 45,159.40
  4. Step 4: Simplify right side
    138,644.20x = 9,391,633,328.22
  5. Step 5: Solve for x
    x = 9,391,633,328.22/138,644.20
  6. Step 6: Final answer
    x = 67,739.10

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1.5x scale

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.