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Finding the Fourth Proportional to 81,081.40, 111,890.52 and 45,274.78

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Solution

The fourth proportional to 81,081.40, 111,890.52 and 45,274.78 is: 62,478.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,081.40 : 111,890.52 = 45,274.78 : x
  2. Step 2: Convert to fraction form
    81,081.40/111,890.52 = 45,274.78/x
  3. Step 3: Cross multiply
    81,081.40x = 111,890.52 × 45,274.78
  4. Step 4: Simplify right side
    81,081.40x = 5,065,818,677.09
  5. Step 5: Solve for x
    x = 5,065,818,677.09/81,081.40
  6. Step 6: Final answer
    x = 62,478.18

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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.