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Finding the Fourth Proportional to 983.28, 1,474.11 and 405.48

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Solution

The fourth proportional to 983.28, 1,474.11 and 405.48 is: 607.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.28 : 1,474.11 = 405.48 : x
  2. Step 2: Convert to fraction form
    983.28/1,474.11 = 405.48/x
  3. Step 3: Cross multiply
    983.28x = 1,474.11 × 405.48
  4. Step 4: Simplify right side
    983.28x = 597,722.12
  5. Step 5: Solve for x
    x = 597,722.12/983.28
  6. Step 6: Final answer
    x = 607.89

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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.