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Finding the Fourth Proportional to 474.28, 654.47 and 439.45

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Solution

The fourth proportional to 474.28, 654.47 and 439.45 is: 606.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    474.28 : 654.47 = 439.45 : x
  2. Step 2: Convert to fraction form
    474.28/654.47 = 439.45/x
  3. Step 3: Cross multiply
    474.28x = 654.47 × 439.45
  4. Step 4: Simplify right side
    474.28x = 287,604.64
  5. Step 5: Solve for x
    x = 287,604.64/474.28
  6. Step 6: Final answer
    x = 606.40

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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.