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Finding the Fourth Proportional to 71.88, 99.09 and 53.52

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Solution

The fourth proportional to 71.88, 99.09 and 53.52 is: 73.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.88 : 99.09 = 53.52 : x
  2. Step 2: Convert to fraction form
    71.88/99.09 = 53.52/x
  3. Step 3: Cross multiply
    71.88x = 99.09 × 53.52
  4. Step 4: Simplify right side
    71.88x = 5,303.30
  5. Step 5: Solve for x
    x = 5,303.30/71.88
  6. Step 6: Final answer
    x = 73.78

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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.