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Finding the Fourth Proportional to 132,959.80, 199,439.70 and 85,720.60

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Solution

The fourth proportional to 132,959.80, 199,439.70 and 85,720.60 is: 128,580.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    132,959.80 : 199,439.70 = 85,720.60 : x
  2. Step 2: Convert to fraction form
    132,959.80/199,439.70 = 85,720.60/x
  3. Step 3: Cross multiply
    132,959.80x = 199,439.70 × 85,720.60
  4. Step 4: Simplify right side
    132,959.80x = 17,096,090,747.82
  5. Step 5: Solve for x
    x = 17,096,090,747.82/132,959.80
  6. Step 6: Final answer
    x = 128,580.90

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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.