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Finding the Fourth Proportional to 217.66, 300.40 and 124.40

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Solution

The fourth proportional to 217.66, 300.40 and 124.40 is: 171.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.66 : 300.40 = 124.40 : x
  2. Step 2: Convert to fraction form
    217.66/300.40 = 124.40/x
  3. Step 3: Cross multiply
    217.66x = 300.40 × 124.40
  4. Step 4: Simplify right side
    217.66x = 37,369.76
  5. Step 5: Solve for x
    x = 37,369.76/217.66
  6. Step 6: Final answer
    x = 171.69

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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.