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Finding the Fourth Proportional to 694.13, 1,039.77 and 400.77

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Solution

The fourth proportional to 694.13, 1,039.77 and 400.77 is: 600.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    694.13 : 1,039.77 = 400.77 : x
  2. Step 2: Convert to fraction form
    694.13/1,039.77 = 400.77/x
  3. Step 3: Cross multiply
    694.13x = 1,039.77 × 400.77
  4. Step 4: Simplify right side
    694.13x = 416,708.62
  5. Step 5: Solve for x
    x = 416,708.62/694.13
  6. Step 6: Final answer
    x = 600.34

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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.