Home / 128,121.28-176,803.69-71,531.44

Finding the Fourth Proportional to 128,121.28, 176,803.69 and 71,531.44

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Solution

The fourth proportional to 128,121.28, 176,803.69 and 71,531.44 is: 98,711.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,121.28 : 176,803.69 = 71,531.44 : x
  2. Step 2: Convert to fraction form
    128,121.28/176,803.69 = 71,531.44/x
  3. Step 3: Cross multiply
    128,121.28x = 176,803.69 × 71,531.44
  4. Step 4: Simplify right side
    128,121.28x = 12,647,021,301.34
  5. Step 5: Solve for x
    x = 12,647,021,301.34/128,121.28
  6. Step 6: Final answer
    x = 98,711.33

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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.