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Finding the Fourth Proportional to 123,190, 170,002.20 and 66,601.38

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Solution

The fourth proportional to 123,190, 170,002.20 and 66,601.38 is: 91,909.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,190 : 170,002.20 = 66,601.38 : x
  2. Step 2: Convert to fraction form
    123,190/170,002.20 = 66,601.38/x
  3. Step 3: Cross multiply
    123,190x = 170,002.20 × 66,601.38
  4. Step 4: Simplify right side
    123,190x = 11,322,381,123.04
  5. Step 5: Solve for x
    x = 11,322,381,123.04/123,190
  6. Step 6: Final answer
    x = 91,909.90

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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.