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Finding the Fourth Proportional to 86,280.48, 129,245.76 and 44,640

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Solution

The fourth proportional to 86,280.48, 129,245.76 and 44,640 is: 66,869.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,280.48 : 129,245.76 = 44,640 : x
  2. Step 2: Convert to fraction form
    86,280.48/129,245.76 = 44,640/x
  3. Step 3: Cross multiply
    86,280.48x = 129,245.76 × 44,640
  4. Step 4: Simplify right side
    86,280.48x = 5,769,530,726.40
  5. Step 5: Solve for x
    x = 5,769,530,726.40/86,280.48
  6. Step 6: Final answer
    x = 66,869.48

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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.