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Finding the Fourth Proportional to 474.20, 654.44 and 287.67

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Solution

The fourth proportional to 474.20, 654.44 and 287.67 is: 397.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    474.20 : 654.44 = 287.67 : x
  2. Step 2: Convert to fraction form
    474.20/654.44 = 287.67/x
  3. Step 3: Cross multiply
    474.20x = 654.44 × 287.67
  4. Step 4: Simplify right side
    474.20x = 188,265.39
  5. Step 5: Solve for x
    x = 188,265.39/474.20
  6. Step 6: Final answer
    x = 397.02

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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.