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Finding the Fourth Proportional to 138,309.40, 207,464.10 and 123,437.80

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Solution

The fourth proportional to 138,309.40, 207,464.10 and 123,437.80 is: 185,156.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,309.40 : 207,464.10 = 123,437.80 : x
  2. Step 2: Convert to fraction form
    138,309.40/207,464.10 = 123,437.80/x
  3. Step 3: Cross multiply
    138,309.40x = 207,464.10 × 123,437.80
  4. Step 4: Simplify right side
    138,309.40x = 25,608,912,082.98
  5. Step 5: Solve for x
    x = 25,608,912,082.98/138,309.40
  6. Step 6: Final answer
    x = 185,156.70

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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.