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Finding the Fourth Proportional to 712.91, 1,068.71 and 279.75

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Solution

The fourth proportional to 712.91, 1,068.71 and 279.75 is: 419.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.91 : 1,068.71 = 279.75 : x
  2. Step 2: Convert to fraction form
    712.91/1,068.71 = 279.75/x
  3. Step 3: Cross multiply
    712.91x = 1,068.71 × 279.75
  4. Step 4: Simplify right side
    712.91x = 298,970.22
  5. Step 5: Solve for x
    x = 298,970.22/712.91
  6. Step 6: Final answer
    x = 419.37

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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.