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Finding the Fourth Proportional to 1,119.15, 1,678.86 and 388.62

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Solution

The fourth proportional to 1,119.15, 1,678.86 and 388.62 is: 582.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,119.15 : 1,678.86 = 388.62 : x
  2. Step 2: Convert to fraction form
    1,119.15/1,678.86 = 388.62/x
  3. Step 3: Cross multiply
    1,119.15x = 1,678.86 × 388.62
  4. Step 4: Simplify right side
    1,119.15x = 652,438.57
  5. Step 5: Solve for x
    x = 652,438.57/1,119.15
  6. Step 6: Final answer
    x = 582.98

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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.