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Finding the Fourth Proportional to 547.92, 821.64 and 520.56

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Solution

The fourth proportional to 547.92, 821.64 and 520.56 is: 780.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    547.92 : 821.64 = 520.56 : x
  2. Step 2: Convert to fraction form
    547.92/821.64 = 520.56/x
  3. Step 3: Cross multiply
    547.92x = 821.64 × 520.56
  4. Step 4: Simplify right side
    547.92x = 427,712.92
  5. Step 5: Solve for x
    x = 427,712.92/547.92
  6. Step 6: Final answer
    x = 780.61

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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.