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Finding the Fourth Proportional to 983.20, 1,474.75 and 289.88

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Solution

The fourth proportional to 983.20, 1,474.75 and 289.88 is: 434.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.20 : 1,474.75 = 289.88 : x
  2. Step 2: Convert to fraction form
    983.20/1,474.75 = 289.88/x
  3. Step 3: Cross multiply
    983.20x = 1,474.75 × 289.88
  4. Step 4: Simplify right side
    983.20x = 427,499.08
  5. Step 5: Solve for x
    x = 427,499.08/983.20
  6. Step 6: Final answer
    x = 434.81

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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.