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Finding the Fourth Proportional to 123,708.56, 185,560.68 and 85,722.80

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Solution

The fourth proportional to 123,708.56, 185,560.68 and 85,722.80 is: 128,582.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,708.56 : 185,560.68 = 85,722.80 : x
  2. Step 2: Convert to fraction form
    123,708.56/185,560.68 = 85,722.80/x
  3. Step 3: Cross multiply
    123,708.56x = 185,560.68 × 85,722.80
  4. Step 4: Simplify right side
    123,708.56x = 15,906,781,059.50
  5. Step 5: Solve for x
    x = 15,906,781,059.50/123,708.56
  6. Step 6: Final answer
    x = 128,582.70

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1.5x scale

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.