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Finding the Fourth Proportional to 82.68, 114.04 and 56.76

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Solution

The fourth proportional to 82.68, 114.04 and 56.76 is: 78.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.68 : 114.04 = 56.76 : x
  2. Step 2: Convert to fraction form
    82.68/114.04 = 56.76/x
  3. Step 3: Cross multiply
    82.68x = 114.04 × 56.76
  4. Step 4: Simplify right side
    82.68x = 6,472.91
  5. Step 5: Solve for x
    x = 6,472.91/82.68
  6. Step 6: Final answer
    x = 78.29

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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.