Home / 81,128.26-121,686.30-28,538.20

Finding the Fourth Proportional to 81,128.26, 121,686.30 and 28,538.20

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Solution

The fourth proportional to 81,128.26, 121,686.30 and 28,538.20 is: 42,805.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,128.26 : 121,686.30 = 28,538.20 : x
  2. Step 2: Convert to fraction form
    81,128.26/121,686.30 = 28,538.20/x
  3. Step 3: Cross multiply
    81,128.26x = 121,686.30 × 28,538.20
  4. Step 4: Simplify right side
    81,128.26x = 3,472,707,966.66
  5. Step 5: Solve for x
    x = 3,472,707,966.66/81,128.26
  6. Step 6: Final answer
    x = 42,805.16

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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.