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Finding the Fourth Proportional to 170.48, 235.21 and 100.55

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Solution

The fourth proportional to 170.48, 235.21 and 100.55 is: 138.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.48 : 235.21 = 100.55 : x
  2. Step 2: Convert to fraction form
    170.48/235.21 = 100.55/x
  3. Step 3: Cross multiply
    170.48x = 235.21 × 100.55
  4. Step 4: Simplify right side
    170.48x = 23,648.94
  5. Step 5: Solve for x
    x = 23,648.94/170.48
  6. Step 6: Final answer
    x = 138.72

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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.