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Finding the Fourth Proportional to 521.24, 778.55 and 405.41

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Solution

The fourth proportional to 521.24, 778.55 and 405.41 is: 605.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.24 : 778.55 = 405.41 : x
  2. Step 2: Convert to fraction form
    521.24/778.55 = 405.41/x
  3. Step 3: Cross multiply
    521.24x = 778.55 × 405.41
  4. Step 4: Simplify right side
    521.24x = 315,626.04
  5. Step 5: Solve for x
    x = 315,626.04/521.24
  6. Step 6: Final answer
    x = 605.54

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.