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Finding the Fourth Proportional to 82.21, 113.57 and 64.77

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Solution

The fourth proportional to 82.21, 113.57 and 64.77 is: 89.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.21 : 113.57 = 64.77 : x
  2. Step 2: Convert to fraction form
    82.21/113.57 = 64.77/x
  3. Step 3: Cross multiply
    82.21x = 113.57 × 64.77
  4. Step 4: Simplify right side
    82.21x = 7,355.93
  5. Step 5: Solve for x
    x = 7,355.93/82.21
  6. Step 6: Final answer
    x = 89.48

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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.