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Finding the Fourth Proportional to 123,478.55, 170,399.32 and 66,889.92

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Solution

The fourth proportional to 123,478.55, 170,399.32 and 66,889.92 is: 92,307.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,478.55 : 170,399.32 = 66,889.92 : x
  2. Step 2: Convert to fraction form
    123,478.55/170,399.32 = 66,889.92/x
  3. Step 3: Cross multiply
    123,478.55x = 170,399.32 × 66,889.92
  4. Step 4: Simplify right side
    123,478.55x = 11,397,996,882.85
  5. Step 5: Solve for x
    x = 11,397,996,882.85/123,478.55
  6. Step 6: Final answer
    x = 92,307.51

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.