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Finding the Fourth Proportional to 82.18, 113.40 and 47.21

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Solution

The fourth proportional to 82.18, 113.40 and 47.21 is: 65.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.18 : 113.40 = 47.21 : x
  2. Step 2: Convert to fraction form
    82.18/113.40 = 47.21/x
  3. Step 3: Cross multiply
    82.18x = 113.40 × 47.21
  4. Step 4: Simplify right side
    82.18x = 5,353.33
  5. Step 5: Solve for x
    x = 5,353.33/82.18
  6. Step 6: Final answer
    x = 65.14

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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.