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Finding the Fourth Proportional to 207.71, 286.53 and 124.80

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Solution

The fourth proportional to 207.71, 286.53 and 124.80 is: 172.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.71 : 286.53 = 124.80 : x
  2. Step 2: Convert to fraction form
    207.71/286.53 = 124.80/x
  3. Step 3: Cross multiply
    207.71x = 286.53 × 124.80
  4. Step 4: Simplify right side
    207.71x = 35,758.94
  5. Step 5: Solve for x
    x = 35,758.94/207.71
  6. Step 6: Final answer
    x = 172.16

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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.