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Finding the Fourth Proportional to 207.16, 285.86 and 128.59

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Solution

The fourth proportional to 207.16, 285.86 and 128.59 is: 177.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.16 : 285.86 = 128.59 : x
  2. Step 2: Convert to fraction form
    207.16/285.86 = 128.59/x
  3. Step 3: Cross multiply
    207.16x = 285.86 × 128.59
  4. Step 4: Simplify right side
    207.16x = 36,758.34
  5. Step 5: Solve for x
    x = 36,758.34/207.16
  6. Step 6: Final answer
    x = 177.44

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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.