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Finding the Fourth Proportional to 138,220.80, 207,003.15 and 85,076.70

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Solution

The fourth proportional to 138,220.80, 207,003.15 and 85,076.70 is: 127,413.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,220.80 : 207,003.15 = 85,076.70 : x
  2. Step 2: Convert to fraction form
    138,220.80/207,003.15 = 85,076.70/x
  3. Step 3: Cross multiply
    138,220.80x = 207,003.15 × 85,076.70
  4. Step 4: Simplify right side
    138,220.80x = 17,611,144,891.61
  5. Step 5: Solve for x
    x = 17,611,144,891.61/138,220.80
  6. Step 6: Final answer
    x = 127,413.13

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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.