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Finding the Fourth Proportional to 40.89, 61.65 and 38.66

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Solution

The fourth proportional to 40.89, 61.65 and 38.66 is: 58.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.89 : 61.65 = 38.66 : x
  2. Step 2: Convert to fraction form
    40.89/61.65 = 38.66/x
  3. Step 3: Cross multiply
    40.89x = 61.65 × 38.66
  4. Step 4: Simplify right side
    40.89x = 2,383.08
  5. Step 5: Solve for x
    x = 2,383.08/40.89
  6. Step 6: Final answer
    x = 58.28

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.