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Finding the Fourth Proportional to 984.38, 1,475.78 and 490.46

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Solution

The fourth proportional to 984.38, 1,475.78 and 490.46 is: 735.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    984.38 : 1,475.78 = 490.46 : x
  2. Step 2: Convert to fraction form
    984.38/1,475.78 = 490.46/x
  3. Step 3: Cross multiply
    984.38x = 1,475.78 × 490.46
  4. Step 4: Simplify right side
    984.38x = 723,801.23
  5. Step 5: Solve for x
    x = 723,801.23/984.38
  6. Step 6: Final answer
    x = 735.29

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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.