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Finding the Fourth Proportional to 82.35, 113.67 and 64.87

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Solution

The fourth proportional to 82.35, 113.67 and 64.87 is: 89.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.35 : 113.67 = 64.87 : x
  2. Step 2: Convert to fraction form
    82.35/113.67 = 64.87/x
  3. Step 3: Cross multiply
    82.35x = 113.67 × 64.87
  4. Step 4: Simplify right side
    82.35x = 7,373.49
  5. Step 5: Solve for x
    x = 7,373.49/82.35
  6. Step 6: Final answer
    x = 89.54

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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.