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Finding the Fourth Proportional to 82.25, 113.36 and 64.72

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Solution

The fourth proportional to 82.25, 113.36 and 64.72 is: 89.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.25 : 113.36 = 64.72 : x
  2. Step 2: Convert to fraction form
    82.25/113.36 = 64.72/x
  3. Step 3: Cross multiply
    82.25x = 113.36 × 64.72
  4. Step 4: Simplify right side
    82.25x = 7,336.09
  5. Step 5: Solve for x
    x = 7,336.09/82.25
  6. Step 6: Final answer
    x = 89.20

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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.