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Finding the Fourth Proportional to 547.36, 820.77 and 391.10

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Solution

The fourth proportional to 547.36, 820.77 and 391.10 is: 586.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    547.36 : 820.77 = 391.10 : x
  2. Step 2: Convert to fraction form
    547.36/820.77 = 391.10/x
  3. Step 3: Cross multiply
    547.36x = 820.77 × 391.10
  4. Step 4: Simplify right side
    547.36x = 320,997.58
  5. Step 5: Solve for x
    x = 320,997.58/547.36
  6. Step 6: Final answer
    x = 586.45

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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.