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Finding the Fourth Proportional to 711.94, 1,068.39 and 279.13

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Solution

The fourth proportional to 711.94, 1,068.39 and 279.13 is: 418.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.94 : 1,068.39 = 279.13 : x
  2. Step 2: Convert to fraction form
    711.94/1,068.39 = 279.13/x
  3. Step 3: Cross multiply
    711.94x = 1,068.39 × 279.13
  4. Step 4: Simplify right side
    711.94x = 298,219.70
  5. Step 5: Solve for x
    x = 298,219.70/711.94
  6. Step 6: Final answer
    x = 418.88

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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.