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Finding the Fourth Proportional to 123,729.26, 170,744.55 and 72,747.72

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Solution

The fourth proportional to 123,729.26, 170,744.55 and 72,747.72 is: 100,390.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,729.26 : 170,744.55 = 72,747.72 : x
  2. Step 2: Convert to fraction form
    123,729.26/170,744.55 = 72,747.72/x
  3. Step 3: Cross multiply
    123,729.26x = 170,744.55 × 72,747.72
  4. Step 4: Simplify right side
    123,729.26x = 12,421,277,491.62
  5. Step 5: Solve for x
    x = 12,421,277,491.62/123,729.26
  6. Step 6: Final answer
    x = 100,390.79

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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.