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Finding the Fourth Proportional to 86,721.25, 129,978.33 and 44,621.50

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Solution

The fourth proportional to 86,721.25, 129,978.33 and 44,621.50 is: 66,878.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,721.25 : 129,978.33 = 44,621.50 : x
  2. Step 2: Convert to fraction form
    86,721.25/129,978.33 = 44,621.50/x
  3. Step 3: Cross multiply
    86,721.25x = 129,978.33 × 44,621.50
  4. Step 4: Simplify right side
    86,721.25x = 5,799,828,052.10
  5. Step 5: Solve for x
    x = 5,799,828,052.10/86,721.25
  6. Step 6: Final answer
    x = 66,878.97

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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.