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Finding the Fourth Proportional to 51.88, 71.59 and 28.88

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Solution

The fourth proportional to 51.88, 71.59 and 28.88 is: 39.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.88 : 71.59 = 28.88 : x
  2. Step 2: Convert to fraction form
    51.88/71.59 = 28.88/x
  3. Step 3: Cross multiply
    51.88x = 71.59 × 28.88
  4. Step 4: Simplify right side
    51.88x = 2,067.16
  5. Step 5: Solve for x
    x = 2,067.16/51.88
  6. Step 6: Final answer
    x = 39.85

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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.