Home / 128,480.40-177,294.33-71,115.85

Finding the Fourth Proportional to 128,480.40, 177,294.33 and 71,115.85

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Solution

The fourth proportional to 128,480.40, 177,294.33 and 71,115.85 is: 98,135.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,480.40 : 177,294.33 = 71,115.85 : x
  2. Step 2: Convert to fraction form
    128,480.40/177,294.33 = 71,115.85/x
  3. Step 3: Cross multiply
    128,480.40x = 177,294.33 × 71,115.85
  4. Step 4: Simplify right side
    128,480.40x = 12,608,436,978.13
  5. Step 5: Solve for x
    x = 12,608,436,978.13/128,480.40
  6. Step 6: Final answer
    x = 98,135.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.