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Finding the Fourth Proportional to 71.92, 99.73 and 70.60

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Solution

The fourth proportional to 71.92, 99.73 and 70.60 is: 97.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.92 : 99.73 = 70.60 : x
  2. Step 2: Convert to fraction form
    71.92/99.73 = 70.60/x
  3. Step 3: Cross multiply
    71.92x = 99.73 × 70.60
  4. Step 4: Simplify right side
    71.92x = 7,040.94
  5. Step 5: Solve for x
    x = 7,040.94/71.92
  6. Step 6: Final answer
    x = 97.90

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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.