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Finding the Fourth Proportional to 207.19, 285.91 and 124.28

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Solution

The fourth proportional to 207.19, 285.91 and 124.28 is: 171.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.19 : 285.91 = 124.28 : x
  2. Step 2: Convert to fraction form
    207.19/285.91 = 124.28/x
  3. Step 3: Cross multiply
    207.19x = 285.91 × 124.28
  4. Step 4: Simplify right side
    207.19x = 35,531.15
  5. Step 5: Solve for x
    x = 35,531.15/207.19
  6. Step 6: Final answer
    x = 171.49

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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.