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Finding the Fourth Proportional to 547.79, 821.48 and 513.36

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Solution

The fourth proportional to 547.79, 821.48 and 513.36 is: 769.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    547.79 : 821.48 = 513.36 : x
  2. Step 2: Convert to fraction form
    547.79/821.48 = 513.36/x
  3. Step 3: Cross multiply
    547.79x = 821.48 × 513.36
  4. Step 4: Simplify right side
    547.79x = 421,712.41
  5. Step 5: Solve for x
    x = 421,712.41/547.79
  6. Step 6: Final answer
    x = 769.85

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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.