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Finding the Fourth Proportional to 1,322.96, 1,984.52 and 398.43

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Solution

The fourth proportional to 1,322.96, 1,984.52 and 398.43 is: 597.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,322.96 : 1,984.52 = 398.43 : x
  2. Step 2: Convert to fraction form
    1,322.96/1,984.52 = 398.43/x
  3. Step 3: Cross multiply
    1,322.96x = 1,984.52 × 398.43
  4. Step 4: Simplify right side
    1,322.96x = 790,693.30
  5. Step 5: Solve for x
    x = 790,693.30/1,322.96
  6. Step 6: Final answer
    x = 597.67

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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.