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Finding the Fourth Proportional to 561.86, 842.89 and 171.85

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Solution

The fourth proportional to 561.86, 842.89 and 171.85 is: 257.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.86 : 842.89 = 171.85 : x
  2. Step 2: Convert to fraction form
    561.86/842.89 = 171.85/x
  3. Step 3: Cross multiply
    561.86x = 842.89 × 171.85
  4. Step 4: Simplify right side
    561.86x = 144,853.70
  5. Step 5: Solve for x
    x = 144,853.70/561.86
  6. Step 6: Final answer
    x = 257.81

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.