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Finding the Fourth Proportional to 82.53, 113.91 and 56.39

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Solution

The fourth proportional to 82.53, 113.91 and 56.39 is: 77.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.53 : 113.91 = 56.39 : x
  2. Step 2: Convert to fraction form
    82.53/113.91 = 56.39/x
  3. Step 3: Cross multiply
    82.53x = 113.91 × 56.39
  4. Step 4: Simplify right side
    82.53x = 6,422.82
  5. Step 5: Solve for x
    x = 6,422.82/82.53
  6. Step 6: Final answer
    x = 77.82

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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.