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Finding the Fourth Proportional to 654.95, 983.28 and 439.49

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Solution

The fourth proportional to 654.95, 983.28 and 439.49 is: 659.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    654.95 : 983.28 = 439.49 : x
  2. Step 2: Convert to fraction form
    654.95/983.28 = 439.49/x
  3. Step 3: Cross multiply
    654.95x = 983.28 × 439.49
  4. Step 4: Simplify right side
    654.95x = 432,141.73
  5. Step 5: Solve for x
    x = 432,141.73/654.95
  6. Step 6: Final answer
    x = 659.81

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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.