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Finding the Fourth Proportional to 71.76, 99.72 and 71.02

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Solution

The fourth proportional to 71.76, 99.72 and 71.02 is: 98.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.76 : 99.72 = 71.02 : x
  2. Step 2: Convert to fraction form
    71.76/99.72 = 71.02/x
  3. Step 3: Cross multiply
    71.76x = 99.72 × 71.02
  4. Step 4: Simplify right side
    71.76x = 7,081.94
  5. Step 5: Solve for x
    x = 7,081.94/71.76
  6. Step 6: Final answer
    x = 98.69

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.