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Finding the Fourth Proportional to 404.86, 558.90 and 287.08

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Solution

The fourth proportional to 404.86, 558.90 and 287.08 is: 396.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.86 : 558.90 = 287.08 : x
  2. Step 2: Convert to fraction form
    404.86/558.90 = 287.08/x
  3. Step 3: Cross multiply
    404.86x = 558.90 × 287.08
  4. Step 4: Simplify right side
    404.86x = 160,449.01
  5. Step 5: Solve for x
    x = 160,449.01/404.86
  6. Step 6: Final answer
    x = 396.31

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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.