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Finding the Fourth Proportional to 507.45, 698.20 and 396.74

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Solution

The fourth proportional to 507.45, 698.20 and 396.74 is: 545.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    507.45 : 698.20 = 396.74 : x
  2. Step 2: Convert to fraction form
    507.45/698.20 = 396.74/x
  3. Step 3: Cross multiply
    507.45x = 698.20 × 396.74
  4. Step 4: Simplify right side
    507.45x = 277,003.87
  5. Step 5: Solve for x
    x = 277,003.87/507.45
  6. Step 6: Final answer
    x = 545.87

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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.