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Finding the Fourth Proportional to 81,129.98, 111,951.34 and 45,319.22

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Solution

The fourth proportional to 81,129.98, 111,951.34 and 45,319.22 is: 62,536.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,129.98 : 111,951.34 = 45,319.22 : x
  2. Step 2: Convert to fraction form
    81,129.98/111,951.34 = 45,319.22/x
  3. Step 3: Cross multiply
    81,129.98x = 111,951.34 × 45,319.22
  4. Step 4: Simplify right side
    81,129.98x = 5,073,547,406.75
  5. Step 5: Solve for x
    x = 5,073,547,406.75/81,129.98
  6. Step 6: Final answer
    x = 62,536.04

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.