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Finding the Fourth Proportional to 100,439.80, 150,659.70 and 85,406.20

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Solution

The fourth proportional to 100,439.80, 150,659.70 and 85,406.20 is: 128,109.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,439.80 : 150,659.70 = 85,406.20 : x
  2. Step 2: Convert to fraction form
    100,439.80/150,659.70 = 85,406.20/x
  3. Step 3: Cross multiply
    100,439.80x = 150,659.70 × 85,406.20
  4. Step 4: Simplify right side
    100,439.80x = 12,867,272,470.14
  5. Step 5: Solve for x
    x = 12,867,272,470.14/100,439.80
  6. Step 6: Final answer
    x = 128,109.30

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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.