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Finding the Fourth Proportional to 64.22, 87.96 and 61.79

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Solution

The fourth proportional to 64.22, 87.96 and 61.79 is: 84.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.22 : 87.96 = 61.79 : x
  2. Step 2: Convert to fraction form
    64.22/87.96 = 61.79/x
  3. Step 3: Cross multiply
    64.22x = 87.96 × 61.79
  4. Step 4: Simplify right side
    64.22x = 5,434.61
  5. Step 5: Solve for x
    x = 5,434.61/64.22
  6. Step 6: Final answer
    x = 84.63

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.