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Finding the Fourth Proportional to 674.35, 1,011.40 and 187.30

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Solution

The fourth proportional to 674.35, 1,011.40 and 187.30 is: 280.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.35 : 1,011.40 = 187.30 : x
  2. Step 2: Convert to fraction form
    674.35/1,011.40 = 187.30/x
  3. Step 3: Cross multiply
    674.35x = 1,011.40 × 187.30
  4. Step 4: Simplify right side
    674.35x = 189,435.22
  5. Step 5: Solve for x
    x = 189,435.22/674.35
  6. Step 6: Final answer
    x = 280.92

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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.