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Finding the Fourth Proportional to 123,431.80, 185,147.70 and 81,441.40

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Solution

The fourth proportional to 123,431.80, 185,147.70 and 81,441.40 is: 122,162.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,431.80 : 185,147.70 = 81,441.40 : x
  2. Step 2: Convert to fraction form
    123,431.80/185,147.70 = 81,441.40/x
  3. Step 3: Cross multiply
    123,431.80x = 185,147.70 × 81,441.40
  4. Step 4: Simplify right side
    123,431.80x = 15,078,687,894.78
  5. Step 5: Solve for x
    x = 15,078,687,894.78/123,431.80
  6. Step 6: Final answer
    x = 122,162.10

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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.