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Finding the Fourth Proportional to 507.20, 699.88 and 286.12

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Solution

The fourth proportional to 507.20, 699.88 and 286.12 is: 394.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    507.20 : 699.88 = 286.12 : x
  2. Step 2: Convert to fraction form
    507.20/699.88 = 286.12/x
  3. Step 3: Cross multiply
    507.20x = 699.88 × 286.12
  4. Step 4: Simplify right side
    507.20x = 200,249.67
  5. Step 5: Solve for x
    x = 200,249.67/507.20
  6. Step 6: Final answer
    x = 394.81

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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.