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Finding the Fourth Proportional to 984.20, 1,358.50 and 689.54

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Solution

The fourth proportional to 984.20, 1,358.50 and 689.54 is: 951.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    984.20 : 1,358.50 = 689.54 : x
  2. Step 2: Convert to fraction form
    984.20/1,358.50 = 689.54/x
  3. Step 3: Cross multiply
    984.20x = 1,358.50 × 689.54
  4. Step 4: Simplify right side
    984.20x = 936,740.09
  5. Step 5: Solve for x
    x = 936,740.09/984.20
  6. Step 6: Final answer
    x = 951.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.