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Finding the Fourth Proportional to 212.75, 319.17 and 66.50

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Solution

The fourth proportional to 212.75, 319.17 and 66.50 is: 99.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.75 : 319.17 = 66.50 : x
  2. Step 2: Convert to fraction form
    212.75/319.17 = 66.50/x
  3. Step 3: Cross multiply
    212.75x = 319.17 × 66.50
  4. Step 4: Simplify right side
    212.75x = 21,224.47
  5. Step 5: Solve for x
    x = 21,224.47/212.75
  6. Step 6: Final answer
    x = 99.76

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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.