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Finding the Fourth Proportional to 674.15, 1,011.15 and 400.10

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Solution

The fourth proportional to 674.15, 1,011.15 and 400.10 is: 600.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.15 : 1,011.15 = 400.10 : x
  2. Step 2: Convert to fraction form
    674.15/1,011.15 = 400.10/x
  3. Step 3: Cross multiply
    674.15x = 1,011.15 × 400.10
  4. Step 4: Simplify right side
    674.15x = 404,556.06
  5. Step 5: Solve for x
    x = 404,556.06/674.15
  6. Step 6: Final answer
    x = 600.10

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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.