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Finding the Fourth Proportional to 38.98, 53.76 and 29.31

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Solution

The fourth proportional to 38.98, 53.76 and 29.31 is: 40.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    38.98 : 53.76 = 29.31 : x
  2. Step 2: Convert to fraction form
    38.98/53.76 = 29.31/x
  3. Step 3: Cross multiply
    38.98x = 53.76 × 29.31
  4. Step 4: Simplify right side
    38.98x = 1,575.71
  5. Step 5: Solve for x
    x = 1,575.71/38.98
  6. Step 6: Final answer
    x = 40.42

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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.