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Finding the Fourth Proportional to 1,118.68, 1,678.20 and 349

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Solution

The fourth proportional to 1,118.68, 1,678.20 and 349 is: 523.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.68 : 1,678.20 = 349 : x
  2. Step 2: Convert to fraction form
    1,118.68/1,678.20 = 349/x
  3. Step 3: Cross multiply
    1,118.68x = 1,678.20 × 349
  4. Step 4: Simplify right side
    1,118.68x = 585,691.80
  5. Step 5: Solve for x
    x = 585,691.80/1,118.68
  6. Step 6: Final answer
    x = 523.56

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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.