Home / 128,932.90-193,399.35-81,693.70

Finding the Fourth Proportional to 128,932.90, 193,399.35 and 81,693.70

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Solution

The fourth proportional to 128,932.90, 193,399.35 and 81,693.70 is: 122,540.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,932.90 : 193,399.35 = 81,693.70 : x
  2. Step 2: Convert to fraction form
    128,932.90/193,399.35 = 81,693.70/x
  3. Step 3: Cross multiply
    128,932.90x = 193,399.35 × 81,693.70
  4. Step 4: Simplify right side
    128,932.90x = 15,799,508,479.10
  5. Step 5: Solve for x
    x = 15,799,508,479.10/128,932.90
  6. Step 6: Final answer
    x = 122,540.55

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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.