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Finding the Fourth Proportional to 1,131.21, 1,696.26 and 400.68

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Solution

The fourth proportional to 1,131.21, 1,696.26 and 400.68 is: 600.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,131.21 : 1,696.26 = 400.68 : x
  2. Step 2: Convert to fraction form
    1,131.21/1,696.26 = 400.68/x
  3. Step 3: Cross multiply
    1,131.21x = 1,696.26 × 400.68
  4. Step 4: Simplify right side
    1,131.21x = 679,657.46
  5. Step 5: Solve for x
    x = 679,657.46/1,131.21
  6. Step 6: Final answer
    x = 600.82

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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.