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Finding the Fourth Proportional to 561.90, 842.86 and 196.61

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Solution

The fourth proportional to 561.90, 842.86 and 196.61 is: 294.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.90 : 842.86 = 196.61 : x
  2. Step 2: Convert to fraction form
    561.90/842.86 = 196.61/x
  3. Step 3: Cross multiply
    561.90x = 842.86 × 196.61
  4. Step 4: Simplify right side
    561.90x = 165,710.82
  5. Step 5: Solve for x
    x = 165,710.82/561.90
  6. Step 6: Final answer
    x = 294.91

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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.