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Finding the Fourth Proportional to 916.11, 1,372.81 and 721.58

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Solution

The fourth proportional to 916.11, 1,372.81 and 721.58 is: 1,081.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.11 : 1,372.81 = 721.58 : x
  2. Step 2: Convert to fraction form
    916.11/1,372.81 = 721.58/x
  3. Step 3: Cross multiply
    916.11x = 1,372.81 × 721.58
  4. Step 4: Simplify right side
    916.11x = 990,596.49
  5. Step 5: Solve for x
    x = 990,596.49/916.11
  6. Step 6: Final answer
    x = 1,081.31

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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.