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Finding the Fourth Proportional to 81,101.25, 111,918.51 and 45,291.78

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Solution

The fourth proportional to 81,101.25, 111,918.51 and 45,291.78 is: 62,501.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,101.25 : 111,918.51 = 45,291.78 : x
  2. Step 2: Convert to fraction form
    81,101.25/111,918.51 = 45,291.78/x
  3. Step 3: Cross multiply
    81,101.25x = 111,918.51 × 45,291.78
  4. Step 4: Simplify right side
    81,101.25x = 5,068,988,532.85
  5. Step 5: Solve for x
    x = 5,068,988,532.85/81,101.25
  6. Step 6: Final answer
    x = 62,501.98

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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.