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Finding the Fourth Proportional to 83,317.68, 124,976.16 and 20,988

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Solution

The fourth proportional to 83,317.68, 124,976.16 and 20,988 is: 31,481.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,317.68 : 124,976.16 = 20,988 : x
  2. Step 2: Convert to fraction form
    83,317.68/124,976.16 = 20,988/x
  3. Step 3: Cross multiply
    83,317.68x = 124,976.16 × 20,988
  4. Step 4: Simplify right side
    83,317.68x = 2,622,999,646.08
  5. Step 5: Solve for x
    x = 2,622,999,646.08/83,317.68
  6. Step 6: Final answer
    x = 31,481.91

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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.