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Finding the Fourth Proportional to 207.90, 287.10 and 142.56

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Solution

The fourth proportional to 207.90, 287.10 and 142.56 is: 196.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.90 : 287.10 = 142.56 : x
  2. Step 2: Convert to fraction form
    207.90/287.10 = 142.56/x
  3. Step 3: Cross multiply
    207.90x = 287.10 × 142.56
  4. Step 4: Simplify right side
    207.90x = 40,928.98
  5. Step 5: Solve for x
    x = 40,928.98/207.90
  6. Step 6: Final answer
    x = 196.87

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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.