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Finding the Fourth Proportional to 138,320.20, 207,480.30 and 85,832.20

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Solution

The fourth proportional to 138,320.20, 207,480.30 and 85,832.20 is: 128,748.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,320.20 : 207,480.30 = 85,832.20 : x
  2. Step 2: Convert to fraction form
    138,320.20/207,480.30 = 85,832.20/x
  3. Step 3: Cross multiply
    138,320.20x = 207,480.30 × 85,832.20
  4. Step 4: Simplify right side
    138,320.20x = 17,808,490,605.66
  5. Step 5: Solve for x
    x = 17,808,490,605.66/138,320.20
  6. Step 6: Final answer
    x = 128,748.30

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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.