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Finding the Fourth Proportional to 547.08, 821.25 and 393.90

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Solution

The fourth proportional to 547.08, 821.25 and 393.90 is: 591.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    547.08 : 821.25 = 393.90 : x
  2. Step 2: Convert to fraction form
    547.08/821.25 = 393.90/x
  3. Step 3: Cross multiply
    547.08x = 821.25 × 393.90
  4. Step 4: Simplify right side
    547.08x = 323,490.38
  5. Step 5: Solve for x
    x = 323,490.38/547.08
  6. Step 6: Final answer
    x = 591.30

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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.