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Finding the Fourth Proportional to 156,790.60, 235,013.10 and 86,720.20

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Solution

The fourth proportional to 156,790.60, 235,013.10 and 86,720.20 is: 129,984.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    156,790.60 : 235,013.10 = 86,720.20 : x
  2. Step 2: Convert to fraction form
    156,790.60/235,013.10 = 86,720.20/x
  3. Step 3: Cross multiply
    156,790.60x = 235,013.10 × 86,720.20
  4. Step 4: Simplify right side
    156,790.60x = 20,380,383,034.62
  5. Step 5: Solve for x
    x = 20,380,383,034.62/156,790.60
  6. Step 6: Final answer
    x = 129,984.73

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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.