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Finding the Fourth Proportional to 984.29, 1,358.38 and 689.65

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Solution

The fourth proportional to 984.29, 1,358.38 and 689.65 is: 951.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    984.29 : 1,358.38 = 689.65 : x
  2. Step 2: Convert to fraction form
    984.29/1,358.38 = 689.65/x
  3. Step 3: Cross multiply
    984.29x = 1,358.38 × 689.65
  4. Step 4: Simplify right side
    984.29x = 936,806.77
  5. Step 5: Solve for x
    x = 936,806.77/984.29
  6. Step 6: Final answer
    x = 951.76

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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.