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Finding the Fourth Proportional to 926.27, 1,278.20 and 553.49

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Solution

The fourth proportional to 926.27, 1,278.20 and 553.49 is: 763.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.27 : 1,278.20 = 553.49 : x
  2. Step 2: Convert to fraction form
    926.27/1,278.20 = 553.49/x
  3. Step 3: Cross multiply
    926.27x = 1,278.20 × 553.49
  4. Step 4: Simplify right side
    926.27x = 707,465.91
  5. Step 5: Solve for x
    x = 707,465.91/926.27
  6. Step 6: Final answer
    x = 763.78

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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.