Home / 86,115.28-129,128.64-38,689.73

Finding the Fourth Proportional to 86,115.28, 129,128.64 and 38,689.73

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Solution

The fourth proportional to 86,115.28, 129,128.64 and 38,689.73 is: 58,014.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,115.28 : 129,128.64 = 38,689.73 : x
  2. Step 2: Convert to fraction form
    86,115.28/129,128.64 = 38,689.73/x
  3. Step 3: Cross multiply
    86,115.28x = 129,128.64 × 38,689.73
  4. Step 4: Simplify right side
    86,115.28x = 4,995,952,216.87
  5. Step 5: Solve for x
    x = 4,995,952,216.87/86,115.28
  6. Step 6: Final answer
    x = 58,014.70

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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.