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Finding the Fourth Proportional to 338.20, 507.12 and 143.08

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Solution

The fourth proportional to 338.20, 507.12 and 143.08 is: 214.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    338.20 : 507.12 = 143.08 : x
  2. Step 2: Convert to fraction form
    338.20/507.12 = 143.08/x
  3. Step 3: Cross multiply
    338.20x = 507.12 × 143.08
  4. Step 4: Simplify right side
    338.20x = 72,558.73
  5. Step 5: Solve for x
    x = 72,558.73/338.20
  6. Step 6: Final answer
    x = 214.54

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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.