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Finding the Fourth Proportional to 207.75, 286.20 and 158.58

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Solution

The fourth proportional to 207.75, 286.20 and 158.58 is: 218.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.75 : 286.20 = 158.58 : x
  2. Step 2: Convert to fraction form
    207.75/286.20 = 158.58/x
  3. Step 3: Cross multiply
    207.75x = 286.20 × 158.58
  4. Step 4: Simplify right side
    207.75x = 45,385.60
  5. Step 5: Solve for x
    x = 45,385.60/207.75
  6. Step 6: Final answer
    x = 218.46

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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.