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Finding the Fourth Proportional to 1,190.72, 1,785.72 and 324.92

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Solution

The fourth proportional to 1,190.72, 1,785.72 and 324.92 is: 487.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,190.72 : 1,785.72 = 324.92 : x
  2. Step 2: Convert to fraction form
    1,190.72/1,785.72 = 324.92/x
  3. Step 3: Cross multiply
    1,190.72x = 1,785.72 × 324.92
  4. Step 4: Simplify right side
    1,190.72x = 580,216.14
  5. Step 5: Solve for x
    x = 580,216.14/1,190.72
  6. Step 6: Final answer
    x = 487.28

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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.