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Finding the Fourth Proportional to 551.36, 824.97 and 545.21

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Solution

The fourth proportional to 551.36, 824.97 and 545.21 is: 815.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.36 : 824.97 = 545.21 : x
  2. Step 2: Convert to fraction form
    551.36/824.97 = 545.21/x
  3. Step 3: Cross multiply
    551.36x = 824.97 × 545.21
  4. Step 4: Simplify right side
    551.36x = 449,777.77
  5. Step 5: Solve for x
    x = 449,777.77/551.36
  6. Step 6: Final answer
    x = 815.77

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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.