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Finding the Fourth Proportional to 217.55, 300 and 158.55

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Solution

The fourth proportional to 217.55, 300 and 158.55 is: 218.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.55 : 300 = 158.55 : x
  2. Step 2: Convert to fraction form
    217.55/300 = 158.55/x
  3. Step 3: Cross multiply
    217.55x = 300 × 158.55
  4. Step 4: Simplify right side
    217.55x = 47,565
  5. Step 5: Solve for x
    x = 47,565/217.55
  6. Step 6: Final answer
    x = 218.64

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.