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Finding the Fourth Proportional to 338.68, 507.97 and 95.21

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Solution

The fourth proportional to 338.68, 507.97 and 95.21 is: 142.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    338.68 : 507.97 = 95.21 : x
  2. Step 2: Convert to fraction form
    338.68/507.97 = 95.21/x
  3. Step 3: Cross multiply
    338.68x = 507.97 × 95.21
  4. Step 4: Simplify right side
    338.68x = 48,363.82
  5. Step 5: Solve for x
    x = 48,363.82/338.68
  6. Step 6: Final answer
    x = 142.80

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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.