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Finding the Fourth Proportional to 404.48, 558.89 and 320.69

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Solution

The fourth proportional to 404.48, 558.89 and 320.69 is: 443.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.48 : 558.89 = 320.69 : x
  2. Step 2: Convert to fraction form
    404.48/558.89 = 320.69/x
  3. Step 3: Cross multiply
    404.48x = 558.89 × 320.69
  4. Step 4: Simplify right side
    404.48x = 179,226.04
  5. Step 5: Solve for x
    x = 179,226.04/404.48
  6. Step 6: Final answer
    x = 443.11

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.