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Finding the Fourth Proportional to 207.72, 286.55 and 124.78

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Solution

The fourth proportional to 207.72, 286.55 and 124.78 is: 172.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.72 : 286.55 = 124.78 : x
  2. Step 2: Convert to fraction form
    207.72/286.55 = 124.78/x
  3. Step 3: Cross multiply
    207.72x = 286.55 × 124.78
  4. Step 4: Simplify right side
    207.72x = 35,755.71
  5. Step 5: Solve for x
    x = 35,755.71/207.72
  6. Step 6: Final answer
    x = 172.13

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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.