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Finding the Fourth Proportional to 561.61, 842.21 and 236.80

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Solution

The fourth proportional to 561.61, 842.21 and 236.80 is: 355.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.61 : 842.21 = 236.80 : x
  2. Step 2: Convert to fraction form
    561.61/842.21 = 236.80/x
  3. Step 3: Cross multiply
    561.61x = 842.21 × 236.80
  4. Step 4: Simplify right side
    561.61x = 199,436.08
  5. Step 5: Solve for x
    x = 199,436.08/561.61
  6. Step 6: Final answer
    x = 355.11

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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.