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Finding the Fourth Proportional to 86,726.80, 129,895.80 and 71,174.80

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Solution

The fourth proportional to 86,726.80, 129,895.80 and 71,174.80 is: 106,602.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,726.80 : 129,895.80 = 71,174.80 : x
  2. Step 2: Convert to fraction form
    86,726.80/129,895.80 = 71,174.80/x
  3. Step 3: Cross multiply
    86,726.80x = 129,895.80 × 71,174.80
  4. Step 4: Simplify right side
    86,726.80x = 9,245,307,585.84
  5. Step 5: Solve for x
    x = 9,245,307,585.84/86,726.80
  6. Step 6: Final answer
    x = 106,602.66

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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.