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Finding the Fourth Proportional to 138,164.80, 207,400.80 and 85,633.60

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Solution

The fourth proportional to 138,164.80, 207,400.80 and 85,633.60 is: 128,545.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,164.80 : 207,400.80 = 85,633.60 : x
  2. Step 2: Convert to fraction form
    138,164.80/207,400.80 = 85,633.60/x
  3. Step 3: Cross multiply
    138,164.80x = 207,400.80 × 85,633.60
  4. Step 4: Simplify right side
    138,164.80x = 17,760,477,146.88
  5. Step 5: Solve for x
    x = 17,760,477,146.88/138,164.80
  6. Step 6: Final answer
    x = 128,545.60

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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.