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Finding the Fourth Proportional to 485.18, 726.74 and 279.63

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Solution

The fourth proportional to 485.18, 726.74 and 279.63 is: 418.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.18 : 726.74 = 279.63 : x
  2. Step 2: Convert to fraction form
    485.18/726.74 = 279.63/x
  3. Step 3: Cross multiply
    485.18x = 726.74 × 279.63
  4. Step 4: Simplify right side
    485.18x = 203,216.91
  5. Step 5: Solve for x
    x = 203,216.91/485.18
  6. Step 6: Final answer
    x = 418.85

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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.