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Finding the Fourth Proportional to 893.43, 1,339.98 and 721.11

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Solution

The fourth proportional to 893.43, 1,339.98 and 721.11 is: 1,081.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    893.43 : 1,339.98 = 721.11 : x
  2. Step 2: Convert to fraction form
    893.43/1,339.98 = 721.11/x
  3. Step 3: Cross multiply
    893.43x = 1,339.98 × 721.11
  4. Step 4: Simplify right side
    893.43x = 966,272.98
  5. Step 5: Solve for x
    x = 966,272.98/893.43
  6. Step 6: Final answer
    x = 1,081.53

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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.