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Finding the Fourth Proportional to 205.72, 309.52 and 124.64

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Solution

The fourth proportional to 205.72, 309.52 and 124.64 is: 187.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.72 : 309.52 = 124.64 : x
  2. Step 2: Convert to fraction form
    205.72/309.52 = 124.64/x
  3. Step 3: Cross multiply
    205.72x = 309.52 × 124.64
  4. Step 4: Simplify right side
    205.72x = 38,578.57
  5. Step 5: Solve for x
    x = 38,578.57/205.72
  6. Step 6: Final answer
    x = 187.53

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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.