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Finding the Fourth Proportional to 207.05, 285.80 and 157.86

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Solution

The fourth proportional to 207.05, 285.80 and 157.86 is: 217.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.05 : 285.80 = 157.86 : x
  2. Step 2: Convert to fraction form
    207.05/285.80 = 157.86/x
  3. Step 3: Cross multiply
    207.05x = 285.80 × 157.86
  4. Step 4: Simplify right side
    207.05x = 45,115.60
  5. Step 5: Solve for x
    x = 45,115.60/207.05
  6. Step 6: Final answer
    x = 217.90

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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.