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Finding the Fourth Proportional to 507.40, 699.94 and 396.84

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Solution

The fourth proportional to 507.40, 699.94 and 396.84 is: 547.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    507.40 : 699.94 = 396.84 : x
  2. Step 2: Convert to fraction form
    507.40/699.94 = 396.84/x
  3. Step 3: Cross multiply
    507.40x = 699.94 × 396.84
  4. Step 4: Simplify right side
    507.40x = 277,764.19
  5. Step 5: Solve for x
    x = 277,764.19/507.40
  6. Step 6: Final answer
    x = 547.43

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.