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Finding the Fourth Proportional to 61.20, 84.45 and 40.44

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Solution

The fourth proportional to 61.20, 84.45 and 40.44 is: 55.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.20 : 84.45 = 40.44 : x
  2. Step 2: Convert to fraction form
    61.20/84.45 = 40.44/x
  3. Step 3: Cross multiply
    61.20x = 84.45 × 40.44
  4. Step 4: Simplify right side
    61.20x = 3,414.74
  5. Step 5: Solve for x
    x = 3,414.74/61.20
  6. Step 6: Final answer
    x = 55.80

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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.