Home / 81,853.69-122,780.54-54,145.21

Finding the Fourth Proportional to 81,853.69, 122,780.54 and 54,145.21

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Solution

The fourth proportional to 81,853.69, 122,780.54 and 54,145.21 is: 81,217.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,853.69 : 122,780.54 = 54,145.21 : x
  2. Step 2: Convert to fraction form
    81,853.69/122,780.54 = 54,145.21/x
  3. Step 3: Cross multiply
    81,853.69x = 122,780.54 × 54,145.21
  4. Step 4: Simplify right side
    81,853.69x = 6,647,977,851.49
  5. Step 5: Solve for x
    x = 6,647,977,851.49/81,853.69
  6. Step 6: Final answer
    x = 81,217.82

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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.