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Finding the Fourth Proportional to 123,729.80, 170,747.08 and 70,013.72

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Solution

The fourth proportional to 123,729.80, 170,747.08 and 70,013.72 is: 96,618.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,729.80 : 170,747.08 = 70,013.72 : x
  2. Step 2: Convert to fraction form
    123,729.80/170,747.08 = 70,013.72/x
  3. Step 3: Cross multiply
    123,729.80x = 170,747.08 × 70,013.72
  4. Step 4: Simplify right side
    123,729.80x = 11,954,638,249.94
  5. Step 5: Solve for x
    x = 11,954,638,249.94/123,729.80
  6. Step 6: Final answer
    x = 96,618.91

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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.