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Finding the Fourth Proportional to 64.80, 97.44 and 61.68

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Solution

The fourth proportional to 64.80, 97.44 and 61.68 is: 92.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.80 : 97.44 = 61.68 : x
  2. Step 2: Convert to fraction form
    64.80/97.44 = 61.68/x
  3. Step 3: Cross multiply
    64.80x = 97.44 × 61.68
  4. Step 4: Simplify right side
    64.80x = 6,010.10
  5. Step 5: Solve for x
    x = 6,010.10/64.80
  6. Step 6: Final answer
    x = 92.75

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.