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Finding the Fourth Proportional to 551.61, 760.19 and 396.09

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Solution

The fourth proportional to 551.61, 760.19 and 396.09 is: 545.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.61 : 760.19 = 396.09 : x
  2. Step 2: Convert to fraction form
    551.61/760.19 = 396.09/x
  3. Step 3: Cross multiply
    551.61x = 760.19 × 396.09
  4. Step 4: Simplify right side
    551.61x = 301,101.68
  5. Step 5: Solve for x
    x = 301,101.68/551.61
  6. Step 6: Final answer
    x = 545.86

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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.