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Finding the Fourth Proportional to 66.12, 98.40 and 63.69

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Solution

The fourth proportional to 66.12, 98.40 and 63.69 is: 94.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.12 : 98.40 = 63.69 : x
  2. Step 2: Convert to fraction form
    66.12/98.40 = 63.69/x
  3. Step 3: Cross multiply
    66.12x = 98.40 × 63.69
  4. Step 4: Simplify right side
    66.12x = 6,267.50
  5. Step 5: Solve for x
    x = 6,267.50/66.12
  6. Step 6: Final answer
    x = 94.79

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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.