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Finding the Fourth Proportional to 926.79, 1,278.72 and 553.61

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Solution

The fourth proportional to 926.79, 1,278.72 and 553.61 is: 763.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.79 : 1,278.72 = 553.61 : x
  2. Step 2: Convert to fraction form
    926.79/1,278.72 = 553.61/x
  3. Step 3: Cross multiply
    926.79x = 1,278.72 × 553.61
  4. Step 4: Simplify right side
    926.79x = 707,905.79
  5. Step 5: Solve for x
    x = 707,905.79/926.79
  6. Step 6: Final answer
    x = 763.83

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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.