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Finding the Fourth Proportional to 82.45, 113.75 and 51.36

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Solution

The fourth proportional to 82.45, 113.75 and 51.36 is: 70.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.45 : 113.75 = 51.36 : x
  2. Step 2: Convert to fraction form
    82.45/113.75 = 51.36/x
  3. Step 3: Cross multiply
    82.45x = 113.75 × 51.36
  4. Step 4: Simplify right side
    82.45x = 5,841.71
  5. Step 5: Solve for x
    x = 5,841.71/82.45
  6. Step 6: Final answer
    x = 70.85

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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.