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Finding the Fourth Proportional to 82.10, 113.02 and 71.68

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Solution

The fourth proportional to 82.10, 113.02 and 71.68 is: 98.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.10 : 113.02 = 71.68 : x
  2. Step 2: Convert to fraction form
    82.10/113.02 = 71.68/x
  3. Step 3: Cross multiply
    82.10x = 113.02 × 71.68
  4. Step 4: Simplify right side
    82.10x = 8,101.27
  5. Step 5: Solve for x
    x = 8,101.27/82.10
  6. Step 6: Final answer
    x = 98.68

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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.