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Finding the Fourth Proportional to 711.88, 1,068.42 and 279.34

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Solution

The fourth proportional to 711.88, 1,068.42 and 279.34 is: 419.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.88 : 1,068.42 = 279.34 : x
  2. Step 2: Convert to fraction form
    711.88/1,068.42 = 279.34/x
  3. Step 3: Cross multiply
    711.88x = 1,068.42 × 279.34
  4. Step 4: Simplify right side
    711.88x = 298,452.44
  5. Step 5: Solve for x
    x = 298,452.44/711.88
  6. Step 6: Final answer
    x = 419.25

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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.