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Finding the Fourth Proportional to 474.39, 654.68 and 287.90

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Solution

The fourth proportional to 474.39, 654.68 and 287.90 is: 397.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    474.39 : 654.68 = 287.90 : x
  2. Step 2: Convert to fraction form
    474.39/654.68 = 287.90/x
  3. Step 3: Cross multiply
    474.39x = 654.68 × 287.90
  4. Step 4: Simplify right side
    474.39x = 188,481.46
  5. Step 5: Solve for x
    x = 188,481.46/474.39
  6. Step 6: Final answer
    x = 397.32

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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.