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Finding the Fourth Proportional to 561.75, 842.31 and 253.92

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Solution

The fourth proportional to 561.75, 842.31 and 253.92 is: 380.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.75 : 842.31 = 253.92 : x
  2. Step 2: Convert to fraction form
    561.75/842.31 = 253.92/x
  3. Step 3: Cross multiply
    561.75x = 842.31 × 253.92
  4. Step 4: Simplify right side
    561.75x = 213,879.36
  5. Step 5: Solve for x
    x = 213,879.36/561.75
  6. Step 6: Final answer
    x = 380.74

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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.