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Finding the Fourth Proportional to 1,115.37, 1,672.71 and 457.22

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Solution

The fourth proportional to 1,115.37, 1,672.71 and 457.22 is: 685.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.37 : 1,672.71 = 457.22 : x
  2. Step 2: Convert to fraction form
    1,115.37/1,672.71 = 457.22/x
  3. Step 3: Cross multiply
    1,115.37x = 1,672.71 × 457.22
  4. Step 4: Simplify right side
    1,115.37x = 764,797.44
  5. Step 5: Solve for x
    x = 764,797.44/1,115.37
  6. Step 6: Final answer
    x = 685.69

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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.