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Finding the Fourth Proportional to 984.38, 1,358.21 and 591.33

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Solution

The fourth proportional to 984.38, 1,358.21 and 591.33 is: 815.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    984.38 : 1,358.21 = 591.33 : x
  2. Step 2: Convert to fraction form
    984.38/1,358.21 = 591.33/x
  3. Step 3: Cross multiply
    984.38x = 1,358.21 × 591.33
  4. Step 4: Simplify right side
    984.38x = 803,147.36
  5. Step 5: Solve for x
    x = 803,147.36/984.38
  6. Step 6: Final answer
    x = 815.89

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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.