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Finding the Fourth Proportional to 38.90, 53.55 and 29.63

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Solution

The fourth proportional to 38.90, 53.55 and 29.63 is: 40.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    38.90 : 53.55 = 29.63 : x
  2. Step 2: Convert to fraction form
    38.90/53.55 = 29.63/x
  3. Step 3: Cross multiply
    38.90x = 53.55 × 29.63
  4. Step 4: Simplify right side
    38.90x = 1,586.69
  5. Step 5: Solve for x
    x = 1,586.69/38.90
  6. Step 6: Final answer
    x = 40.79

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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.