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Finding the Fourth Proportional to 926.52, 1,391.40 and 721.59

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Solution

The fourth proportional to 926.52, 1,391.40 and 721.59 is: 1,083.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.52 : 1,391.40 = 721.59 : x
  2. Step 2: Convert to fraction form
    926.52/1,391.40 = 721.59/x
  3. Step 3: Cross multiply
    926.52x = 1,391.40 × 721.59
  4. Step 4: Simplify right side
    926.52x = 1,004,020.33
  5. Step 5: Solve for x
    x = 1,004,020.33/926.52
  6. Step 6: Final answer
    x = 1,083.65

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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.