Home / 128,328.59-192,016.13-80,721.38

Finding the Fourth Proportional to 128,328.59, 192,016.13 and 80,721.38

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Solution

The fourth proportional to 128,328.59, 192,016.13 and 80,721.38 is: 120,782.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,328.59 : 192,016.13 = 80,721.38 : x
  2. Step 2: Convert to fraction form
    128,328.59/192,016.13 = 80,721.38/x
  3. Step 3: Cross multiply
    128,328.59x = 192,016.13 × 80,721.38
  4. Step 4: Simplify right side
    128,328.59x = 15,499,805,632.17
  5. Step 5: Solve for x
    x = 15,499,805,632.17/128,328.59
  6. Step 6: Final answer
    x = 120,782.18

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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.