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Finding the Fourth Proportional to 66.50, 99.71 and 54.95

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Solution

The fourth proportional to 66.50, 99.71 and 54.95 is: 82.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.50 : 99.71 = 54.95 : x
  2. Step 2: Convert to fraction form
    66.50/99.71 = 54.95/x
  3. Step 3: Cross multiply
    66.50x = 99.71 × 54.95
  4. Step 4: Simplify right side
    66.50x = 5,479.45
  5. Step 5: Solve for x
    x = 5,479.45/66.50
  6. Step 6: Final answer
    x = 82.40

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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.