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Finding the Fourth Proportional to 926.33, 1,278.14 and 553.05

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Solution

The fourth proportional to 926.33, 1,278.14 and 553.05 is: 763.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.33 : 1,278.14 = 553.05 : x
  2. Step 2: Convert to fraction form
    926.33/1,278.14 = 553.05/x
  3. Step 3: Cross multiply
    926.33x = 1,278.14 × 553.05
  4. Step 4: Simplify right side
    926.33x = 706,872.56
  5. Step 5: Solve for x
    x = 706,872.56/926.33
  6. Step 6: Final answer
    x = 763.09

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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.