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Finding the Fourth Proportional to 674.81, 1,012.09 and 187.91

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Solution

The fourth proportional to 674.81, 1,012.09 and 187.91 is: 281.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.81 : 1,012.09 = 187.91 : x
  2. Step 2: Convert to fraction form
    674.81/1,012.09 = 187.91/x
  3. Step 3: Cross multiply
    674.81x = 1,012.09 × 187.91
  4. Step 4: Simplify right side
    674.81x = 190,181.83
  5. Step 5: Solve for x
    x = 190,181.83/674.81
  6. Step 6: Final answer
    x = 281.83

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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.