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Finding the Fourth Proportional to 920.27, 1,269.99 and 721.35

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Solution

The fourth proportional to 920.27, 1,269.99 and 721.35 is: 995.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.27 : 1,269.99 = 721.35 : x
  2. Step 2: Convert to fraction form
    920.27/1,269.99 = 721.35/x
  3. Step 3: Cross multiply
    920.27x = 1,269.99 × 721.35
  4. Step 4: Simplify right side
    920.27x = 916,107.29
  5. Step 5: Solve for x
    x = 916,107.29/920.27
  6. Step 6: Final answer
    x = 995.47

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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.