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Finding the Fourth Proportional to 170.86, 235.82 and 105.40

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Solution

The fourth proportional to 170.86, 235.82 and 105.40 is: 145.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.86 : 235.82 = 105.40 : x
  2. Step 2: Convert to fraction form
    170.86/235.82 = 105.40/x
  3. Step 3: Cross multiply
    170.86x = 235.82 × 105.40
  4. Step 4: Simplify right side
    170.86x = 24,856.13
  5. Step 5: Solve for x
    x = 24,856.13/170.86
  6. Step 6: Final answer
    x = 145.48

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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.