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Finding the Fourth Proportional to 159.45, 220.05 and 103.45

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Solution

The fourth proportional to 159.45, 220.05 and 103.45 is: 142.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.45 : 220.05 = 103.45 : x
  2. Step 2: Convert to fraction form
    159.45/220.05 = 103.45/x
  3. Step 3: Cross multiply
    159.45x = 220.05 × 103.45
  4. Step 4: Simplify right side
    159.45x = 22,764.17
  5. Step 5: Solve for x
    x = 22,764.17/159.45
  6. Step 6: Final answer
    x = 142.76

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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.