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Finding the Fourth Proportional to 138,328.80, 207,493.20 and 85,840.80

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Solution

The fourth proportional to 138,328.80, 207,493.20 and 85,840.80 is: 128,761.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,328.80 : 207,493.20 = 85,840.80 : x
  2. Step 2: Convert to fraction form
    138,328.80/207,493.20 = 85,840.80/x
  3. Step 3: Cross multiply
    138,328.80x = 207,493.20 × 85,840.80
  4. Step 4: Simplify right side
    138,328.80x = 17,811,382,282.56
  5. Step 5: Solve for x
    x = 17,811,382,282.56/138,328.80
  6. Step 6: Final answer
    x = 128,761.20

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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.