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Finding the Fourth Proportional to 82.65, 114.01 and 64.20

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Solution

The fourth proportional to 82.65, 114.01 and 64.20 is: 88.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.65 : 114.01 = 64.20 : x
  2. Step 2: Convert to fraction form
    82.65/114.01 = 64.20/x
  3. Step 3: Cross multiply
    82.65x = 114.01 × 64.20
  4. Step 4: Simplify right side
    82.65x = 7,319.44
  5. Step 5: Solve for x
    x = 7,319.44/82.65
  6. Step 6: Final answer
    x = 88.56

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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.