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Finding the Fourth Proportional to 82.43, 113.51 and 70.75

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Solution

The fourth proportional to 82.43, 113.51 and 70.75 is: 97.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.43 : 113.51 = 70.75 : x
  2. Step 2: Convert to fraction form
    82.43/113.51 = 70.75/x
  3. Step 3: Cross multiply
    82.43x = 113.51 × 70.75
  4. Step 4: Simplify right side
    82.43x = 8,031.20
  5. Step 5: Solve for x
    x = 8,031.20/82.43
  6. Step 6: Final answer
    x = 97.43

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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.