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Finding the Fourth Proportional to 207.12, 285.72 and 140.75

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Solution

The fourth proportional to 207.12, 285.72 and 140.75 is: 194.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.12 : 285.72 = 140.75 : x
  2. Step 2: Convert to fraction form
    207.12/285.72 = 140.75/x
  3. Step 3: Cross multiply
    207.12x = 285.72 × 140.75
  4. Step 4: Simplify right side
    207.12x = 40,213.66
  5. Step 5: Solve for x
    x = 40,213.66/207.12
  6. Step 6: Final answer
    x = 194.16

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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.