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Finding the Fourth Proportional to 170.86, 235.72 and 100.92

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Solution

The fourth proportional to 170.86, 235.72 and 100.92 is: 139.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.86 : 235.72 = 100.92 : x
  2. Step 2: Convert to fraction form
    170.86/235.72 = 100.92/x
  3. Step 3: Cross multiply
    170.86x = 235.72 × 100.92
  4. Step 4: Simplify right side
    170.86x = 23,788.86
  5. Step 5: Solve for x
    x = 23,788.86/170.86
  6. Step 6: Final answer
    x = 139.23

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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.