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Finding the Fourth Proportional to 217.85, 300.65 and 151.58

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Solution

The fourth proportional to 217.85, 300.65 and 151.58 is: 209.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.85 : 300.65 = 151.58 : x
  2. Step 2: Convert to fraction form
    217.85/300.65 = 151.58/x
  3. Step 3: Cross multiply
    217.85x = 300.65 × 151.58
  4. Step 4: Simplify right side
    217.85x = 45,572.52
  5. Step 5: Solve for x
    x = 45,572.52/217.85
  6. Step 6: Final answer
    x = 209.20

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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.