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Finding the Fourth Proportional to 674.68, 1,011.94 and 289.64

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Solution

The fourth proportional to 674.68, 1,011.94 and 289.64 is: 434.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.68 : 1,011.94 = 289.64 : x
  2. Step 2: Convert to fraction form
    674.68/1,011.94 = 289.64/x
  3. Step 3: Cross multiply
    674.68x = 1,011.94 × 289.64
  4. Step 4: Simplify right side
    674.68x = 293,098.30
  5. Step 5: Solve for x
    x = 293,098.30/674.68
  6. Step 6: Final answer
    x = 434.43

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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.