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Finding the Fourth Proportional to 71.88, 99.21 and 53.44

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Solution

The fourth proportional to 71.88, 99.21 and 53.44 is: 73.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.88 : 99.21 = 53.44 : x
  2. Step 2: Convert to fraction form
    71.88/99.21 = 53.44/x
  3. Step 3: Cross multiply
    71.88x = 99.21 × 53.44
  4. Step 4: Simplify right side
    71.88x = 5,301.78
  5. Step 5: Solve for x
    x = 5,301.78/71.88
  6. Step 6: Final answer
    x = 73.76

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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.