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Finding the Fourth Proportional to 1,322.82, 1,984.32 and 457.20

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Solution

The fourth proportional to 1,322.82, 1,984.32 and 457.20 is: 685.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,322.82 : 1,984.32 = 457.20 : x
  2. Step 2: Convert to fraction form
    1,322.82/1,984.32 = 457.20/x
  3. Step 3: Cross multiply
    1,322.82x = 1,984.32 × 457.20
  4. Step 4: Simplify right side
    1,322.82x = 907,231.10
  5. Step 5: Solve for x
    x = 907,231.10/1,322.82
  6. Step 6: Final answer
    x = 685.83

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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.