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Finding the Fourth Proportional to 1,118.92, 1,678.38 and 388.44

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Solution

The fourth proportional to 1,118.92, 1,678.38 and 388.44 is: 582.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.92 : 1,678.38 = 388.44 : x
  2. Step 2: Convert to fraction form
    1,118.92/1,678.38 = 388.44/x
  3. Step 3: Cross multiply
    1,118.92x = 1,678.38 × 388.44
  4. Step 4: Simplify right side
    1,118.92x = 651,949.93
  5. Step 5: Solve for x
    x = 651,949.93/1,118.92
  6. Step 6: Final answer
    x = 582.66

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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.