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Finding the Fourth Proportional to 82.10, 122.56 and 75.29

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Solution

The fourth proportional to 82.10, 122.56 and 75.29 is: 112.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.10 : 122.56 = 75.29 : x
  2. Step 2: Convert to fraction form
    82.10/122.56 = 75.29/x
  3. Step 3: Cross multiply
    82.10x = 122.56 × 75.29
  4. Step 4: Simplify right side
    82.10x = 9,226.74
  5. Step 5: Solve for x
    x = 9,226.74/82.10
  6. Step 6: Final answer
    x = 112.38

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.