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Finding the Fourth Proportional to 207.79, 286.74 and 124.90

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Solution

The fourth proportional to 207.79, 286.74 and 124.90 is: 172.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.79 : 286.74 = 124.90 : x
  2. Step 2: Convert to fraction form
    207.79/286.74 = 124.90/x
  3. Step 3: Cross multiply
    207.79x = 286.74 × 124.90
  4. Step 4: Simplify right side
    207.79x = 35,813.83
  5. Step 5: Solve for x
    x = 35,813.83/207.79
  6. Step 6: Final answer
    x = 172.36

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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.