Home / 86,425.13-129,637.70-20,761.13

Finding the Fourth Proportional to 86,425.13, 129,637.70 and 20,761.13

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Solution

The fourth proportional to 86,425.13, 129,637.70 and 20,761.13 is: 31,141.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,425.13 : 129,637.70 = 20,761.13 : x
  2. Step 2: Convert to fraction form
    86,425.13/129,637.70 = 20,761.13/x
  3. Step 3: Cross multiply
    86,425.13x = 129,637.70 × 20,761.13
  4. Step 4: Simplify right side
    86,425.13x = 2,691,424,390.61
  5. Step 5: Solve for x
    x = 2,691,424,390.61/86,425.13
  6. Step 6: Final answer
    x = 31,141.69

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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.