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Finding the Fourth Proportional to 38.88, 53.28 and 38.43

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Solution

The fourth proportional to 38.88, 53.28 and 38.43 is: 52.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    38.88 : 53.28 = 38.43 : x
  2. Step 2: Convert to fraction form
    38.88/53.28 = 38.43/x
  3. Step 3: Cross multiply
    38.88x = 53.28 × 38.43
  4. Step 4: Simplify right side
    38.88x = 2,047.55
  5. Step 5: Solve for x
    x = 2,047.55/38.88
  6. Step 6: Final answer
    x = 52.66

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.