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Finding the Fourth Proportional to 69.79, 103.98 and 66.35

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Solution

The fourth proportional to 69.79, 103.98 and 66.35 is: 98.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.79 : 103.98 = 66.35 : x
  2. Step 2: Convert to fraction form
    69.79/103.98 = 66.35/x
  3. Step 3: Cross multiply
    69.79x = 103.98 × 66.35
  4. Step 4: Simplify right side
    69.79x = 6,898.65
  5. Step 5: Solve for x
    x = 6,898.65/69.79
  6. Step 6: Final answer
    x = 98.85

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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.