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Finding the Fourth Proportional to 984.05, 1,358.67 and 689.72

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Solution

The fourth proportional to 984.05, 1,358.67 and 689.72 is: 952.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    984.05 : 1,358.67 = 689.72 : x
  2. Step 2: Convert to fraction form
    984.05/1,358.67 = 689.72/x
  3. Step 3: Cross multiply
    984.05x = 1,358.67 × 689.72
  4. Step 4: Simplify right side
    984.05x = 937,095.08
  5. Step 5: Solve for x
    x = 937,095.08/984.05
  6. Step 6: Final answer
    x = 952.29

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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.