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Finding the Fourth Proportional to 1,189.78, 1,785.13 and 496.27

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Solution

The fourth proportional to 1,189.78, 1,785.13 and 496.27 is: 744.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,189.78 : 1,785.13 = 496.27 : x
  2. Step 2: Convert to fraction form
    1,189.78/1,785.13 = 496.27/x
  3. Step 3: Cross multiply
    1,189.78x = 1,785.13 × 496.27
  4. Step 4: Simplify right side
    1,189.78x = 885,906.47
  5. Step 5: Solve for x
    x = 885,906.47/1,189.78
  6. Step 6: Final answer
    x = 744.60

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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.