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Finding the Fourth Proportional to 674.15, 1,011.10 and 187.21

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Solution

The fourth proportional to 674.15, 1,011.10 and 187.21 is: 280.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.15 : 1,011.10 = 187.21 : x
  2. Step 2: Convert to fraction form
    674.15/1,011.10 = 187.21/x
  3. Step 3: Cross multiply
    674.15x = 1,011.10 × 187.21
  4. Step 4: Simplify right side
    674.15x = 189,285.97
  5. Step 5: Solve for x
    x = 189,285.97/674.15
  6. Step 6: Final answer
    x = 280.78

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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.