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Finding the Fourth Proportional to 1,119.92, 1,678.91 and 389.40

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Solution

The fourth proportional to 1,119.92, 1,678.91 and 389.40 is: 583.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,119.92 : 1,678.91 = 389.40 : x
  2. Step 2: Convert to fraction form
    1,119.92/1,678.91 = 389.40/x
  3. Step 3: Cross multiply
    1,119.92x = 1,678.91 × 389.40
  4. Step 4: Simplify right side
    1,119.92x = 653,761.50
  5. Step 5: Solve for x
    x = 653,761.50/1,119.92
  6. Step 6: Final answer
    x = 583.76

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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.