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Finding the Fourth Proportional to 207.17, 285.82 and 128.49

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Solution

The fourth proportional to 207.17, 285.82 and 128.49 is: 177.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.17 : 285.82 = 128.49 : x
  2. Step 2: Convert to fraction form
    207.17/285.82 = 128.49/x
  3. Step 3: Cross multiply
    207.17x = 285.82 × 128.49
  4. Step 4: Simplify right side
    207.17x = 36,725.01
  5. Step 5: Solve for x
    x = 36,725.01/207.17
  6. Step 6: Final answer
    x = 177.27

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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.