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Finding the Fourth Proportional to 474.12, 654.33 and 287.65

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Solution

The fourth proportional to 474.12, 654.33 and 287.65 is: 396.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    474.12 : 654.33 = 287.65 : x
  2. Step 2: Convert to fraction form
    474.12/654.33 = 287.65/x
  3. Step 3: Cross multiply
    474.12x = 654.33 × 287.65
  4. Step 4: Simplify right side
    474.12x = 188,220.12
  5. Step 5: Solve for x
    x = 188,220.12/474.12
  6. Step 6: Final answer
    x = 396.99

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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.