Home / 81,669.11-122,306.81-81,078.62

Finding the Fourth Proportional to 81,669.11, 122,306.81 and 81,078.62

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Solution

The fourth proportional to 81,669.11, 122,306.81 and 81,078.62 is: 121,422.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,669.11 : 122,306.81 = 81,078.62 : x
  2. Step 2: Convert to fraction form
    81,669.11/122,306.81 = 81,078.62/x
  3. Step 3: Cross multiply
    81,669.11x = 122,306.81 × 81,078.62
  4. Step 4: Simplify right side
    81,669.11x = 9,916,466,354.48
  5. Step 5: Solve for x
    x = 9,916,466,354.48/81,669.11
  6. Step 6: Final answer
    x = 121,422.49

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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.