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Finding the Fourth Proportional to 64.98, 89.16 and 61.92

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Solution

The fourth proportional to 64.98, 89.16 and 61.92 is: 84.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.98 : 89.16 = 61.92 : x
  2. Step 2: Convert to fraction form
    64.98/89.16 = 61.92/x
  3. Step 3: Cross multiply
    64.98x = 89.16 × 61.92
  4. Step 4: Simplify right side
    64.98x = 5,520.79
  5. Step 5: Solve for x
    x = 5,520.79/64.98
  6. Step 6: Final answer
    x = 84.96

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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.