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Finding the Fourth Proportional to 879.53, 1,215.50 and 721.94

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Solution

The fourth proportional to 879.53, 1,215.50 and 721.94 is: 997.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.53 : 1,215.50 = 721.94 : x
  2. Step 2: Convert to fraction form
    879.53/1,215.50 = 721.94/x
  3. Step 3: Cross multiply
    879.53x = 1,215.50 × 721.94
  4. Step 4: Simplify right side
    879.53x = 877,508.38
  5. Step 5: Solve for x
    x = 877,508.38/879.53
  6. Step 6: Final answer
    x = 997.71

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.