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Finding the Fourth Proportional to 217.77, 326.70 and 71.53

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Solution

The fourth proportional to 217.77, 326.70 and 71.53 is: 107.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.77 : 326.70 = 71.53 : x
  2. Step 2: Convert to fraction form
    217.77/326.70 = 71.53/x
  3. Step 3: Cross multiply
    217.77x = 326.70 × 71.53
  4. Step 4: Simplify right side
    217.77x = 23,368.80
  5. Step 5: Solve for x
    x = 23,368.80/217.77
  6. Step 6: Final answer
    x = 107.31

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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.