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Finding the Fourth Proportional to 338.53, 507.42 and 143.69

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Solution

The fourth proportional to 338.53, 507.42 and 143.69 is: 215.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    338.53 : 507.42 = 143.69 : x
  2. Step 2: Convert to fraction form
    338.53/507.42 = 143.69/x
  3. Step 3: Cross multiply
    338.53x = 507.42 × 143.69
  4. Step 4: Simplify right side
    338.53x = 72,912.71
  5. Step 5: Solve for x
    x = 72,912.71/338.53
  6. Step 6: Final answer
    x = 215.38

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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.