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Finding the Fourth Proportional to 561.30, 842.09 and 330.38

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Solution

The fourth proportional to 561.30, 842.09 and 330.38 is: 495.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.30 : 842.09 = 330.38 : x
  2. Step 2: Convert to fraction form
    561.30/842.09 = 330.38/x
  3. Step 3: Cross multiply
    561.30x = 842.09 × 330.38
  4. Step 4: Simplify right side
    561.30x = 278,203.83
  5. Step 5: Solve for x
    x = 278,203.83/561.30
  6. Step 6: Final answer
    x = 495.64

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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.