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Finding the Fourth Proportional to 1,118.85, 1,678.61 and 388.43

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Solution

The fourth proportional to 1,118.85, 1,678.61 and 388.43 is: 582.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.85 : 1,678.61 = 388.43 : x
  2. Step 2: Convert to fraction form
    1,118.85/1,678.61 = 388.43/x
  3. Step 3: Cross multiply
    1,118.85x = 1,678.61 × 388.43
  4. Step 4: Simplify right side
    1,118.85x = 652,022.48
  5. Step 5: Solve for x
    x = 652,022.48/1,118.85
  6. Step 6: Final answer
    x = 582.76

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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.