Home / 138,867.20-208,300.80-85,723.10

Finding the Fourth Proportional to 138,867.20, 208,300.80 and 85,723.10

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Solution

The fourth proportional to 138,867.20, 208,300.80 and 85,723.10 is: 128,584.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,867.20 : 208,300.80 = 85,723.10 : x
  2. Step 2: Convert to fraction form
    138,867.20/208,300.80 = 85,723.10/x
  3. Step 3: Cross multiply
    138,867.20x = 208,300.80 × 85,723.10
  4. Step 4: Simplify right side
    138,867.20x = 17,856,190,308.48
  5. Step 5: Solve for x
    x = 17,856,190,308.48/138,867.20
  6. Step 6: Final answer
    x = 128,584.65

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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.