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Finding the Fourth Proportional to 38.88, 53.60 and 29.66

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Solution

The fourth proportional to 38.88, 53.60 and 29.66 is: 40.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    38.88 : 53.60 = 29.66 : x
  2. Step 2: Convert to fraction form
    38.88/53.60 = 29.66/x
  3. Step 3: Cross multiply
    38.88x = 53.60 × 29.66
  4. Step 4: Simplify right side
    38.88x = 1,589.36
  5. Step 5: Solve for x
    x = 1,589.36/38.88
  6. Step 6: Final answer
    x = 40.88

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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.