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Finding the Fourth Proportional to 170.78, 235.61 and 103.46

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Solution

The fourth proportional to 170.78, 235.61 and 103.46 is: 142.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.78 : 235.61 = 103.46 : x
  2. Step 2: Convert to fraction form
    170.78/235.61 = 103.46/x
  3. Step 3: Cross multiply
    170.78x = 235.61 × 103.46
  4. Step 4: Simplify right side
    170.78x = 24,374.52
  5. Step 5: Solve for x
    x = 24,374.52/170.78
  6. Step 6: Final answer
    x = 142.73

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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.