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Finding the Fourth Proportional to 69.86, 104.21 and 64.95

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Solution

The fourth proportional to 69.86, 104.21 and 64.95 is: 96.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.86 : 104.21 = 64.95 : x
  2. Step 2: Convert to fraction form
    69.86/104.21 = 64.95/x
  3. Step 3: Cross multiply
    69.86x = 104.21 × 64.95
  4. Step 4: Simplify right side
    69.86x = 6,767.92
  5. Step 5: Solve for x
    x = 6,767.92/69.86
  6. Step 6: Final answer
    x = 96.89

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.