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Finding the Fourth Proportional to 69.32, 104.51 and 64.92

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Solution

The fourth proportional to 69.32, 104.51 and 64.92 is: 97.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.32 : 104.51 = 64.92 : x
  2. Step 2: Convert to fraction form
    69.32/104.51 = 64.92/x
  3. Step 3: Cross multiply
    69.32x = 104.51 × 64.92
  4. Step 4: Simplify right side
    69.32x = 6,784.76
  5. Step 5: Solve for x
    x = 6,784.76/69.32
  6. Step 6: Final answer
    x = 97.87

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.