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Finding the Fourth Proportional to 1,131.28, 1,696.87 and 400.84

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Solution

The fourth proportional to 1,131.28, 1,696.87 and 400.84 is: 601.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,131.28 : 1,696.87 = 400.84 : x
  2. Step 2: Convert to fraction form
    1,131.28/1,696.87 = 400.84/x
  3. Step 3: Cross multiply
    1,131.28x = 1,696.87 × 400.84
  4. Step 4: Simplify right side
    1,131.28x = 680,173.37
  5. Step 5: Solve for x
    x = 680,173.37/1,131.28
  6. Step 6: Final answer
    x = 601.24

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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.