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Finding the Fourth Proportional to 661.28, 993.86 and 319.52

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Solution

The fourth proportional to 661.28, 993.86 and 319.52 is: 480.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.28 : 993.86 = 319.52 : x
  2. Step 2: Convert to fraction form
    661.28/993.86 = 319.52/x
  3. Step 3: Cross multiply
    661.28x = 993.86 × 319.52
  4. Step 4: Simplify right side
    661.28x = 317,558.15
  5. Step 5: Solve for x
    x = 317,558.15/661.28
  6. Step 6: Final answer
    x = 480.22

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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.