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Finding the Fourth Proportional to 842.72, 1,264 and 403.88

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Solution

The fourth proportional to 842.72, 1,264 and 403.88 is: 605.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.72 : 1,264 = 403.88 : x
  2. Step 2: Convert to fraction form
    842.72/1,264 = 403.88/x
  3. Step 3: Cross multiply
    842.72x = 1,264 × 403.88
  4. Step 4: Simplify right side
    842.72x = 510,504.32
  5. Step 5: Solve for x
    x = 510,504.32/842.72
  6. Step 6: Final answer
    x = 605.78

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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.