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Finding the Fourth Proportional to 674.76, 1,010.78 and 309.04

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Solution

The fourth proportional to 674.76, 1,010.78 and 309.04 is: 462.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.76 : 1,010.78 = 309.04 : x
  2. Step 2: Convert to fraction form
    674.76/1,010.78 = 309.04/x
  3. Step 3: Cross multiply
    674.76x = 1,010.78 × 309.04
  4. Step 4: Simplify right side
    674.76x = 312,371.45
  5. Step 5: Solve for x
    x = 312,371.45/674.76
  6. Step 6: Final answer
    x = 462.94

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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.