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Finding the Fourth Proportional to 718.07, 1,076.93 and 279.17

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Solution

The fourth proportional to 718.07, 1,076.93 and 279.17 is: 418.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.07 : 1,076.93 = 279.17 : x
  2. Step 2: Convert to fraction form
    718.07/1,076.93 = 279.17/x
  3. Step 3: Cross multiply
    718.07x = 1,076.93 × 279.17
  4. Step 4: Simplify right side
    718.07x = 300,645.15
  5. Step 5: Solve for x
    x = 300,645.15/718.07
  6. Step 6: Final answer
    x = 418.69

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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.