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Finding the Fourth Proportional to 207.96, 287.04 and 142.48

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Solution

The fourth proportional to 207.96, 287.04 and 142.48 is: 196.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.96 : 287.04 = 142.48 : x
  2. Step 2: Convert to fraction form
    207.96/287.04 = 142.48/x
  3. Step 3: Cross multiply
    207.96x = 287.04 × 142.48
  4. Step 4: Simplify right side
    207.96x = 40,897.46
  5. Step 5: Solve for x
    x = 40,897.46/207.96
  6. Step 6: Final answer
    x = 196.66

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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.