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Finding the Fourth Proportional to 926.90, 1,278.82 and 553.95

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Solution

The fourth proportional to 926.90, 1,278.82 and 553.95 is: 764.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.90 : 1,278.82 = 553.95 : x
  2. Step 2: Convert to fraction form
    926.90/1,278.82 = 553.95/x
  3. Step 3: Cross multiply
    926.90x = 1,278.82 × 553.95
  4. Step 4: Simplify right side
    926.90x = 708,400.95
  5. Step 5: Solve for x
    x = 708,400.95/926.90
  6. Step 6: Final answer
    x = 764.27

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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.