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Finding the Fourth Proportional to 842.40, 1,263.44 and 294.56

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Solution

The fourth proportional to 842.40, 1,263.44 and 294.56 is: 441.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.40 : 1,263.44 = 294.56 : x
  2. Step 2: Convert to fraction form
    842.40/1,263.44 = 294.56/x
  3. Step 3: Cross multiply
    842.40x = 1,263.44 × 294.56
  4. Step 4: Simplify right side
    842.40x = 372,158.89
  5. Step 5: Solve for x
    x = 372,158.89/842.40
  6. Step 6: Final answer
    x = 441.78

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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.