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Finding the Fourth Proportional to 674.24, 1,013.28 and 400.40

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Solution

The fourth proportional to 674.24, 1,013.28 and 400.40 is: 601.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.24 : 1,013.28 = 400.40 : x
  2. Step 2: Convert to fraction form
    674.24/1,013.28 = 400.40/x
  3. Step 3: Cross multiply
    674.24x = 1,013.28 × 400.40
  4. Step 4: Simplify right side
    674.24x = 405,717.31
  5. Step 5: Solve for x
    x = 405,717.31/674.24
  6. Step 6: Final answer
    x = 601.74

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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.