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Finding the Fourth Proportional to 301.78, 452.37 and 139.42

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Solution

The fourth proportional to 301.78, 452.37 and 139.42 is: 208.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    301.78 : 452.37 = 139.42 : x
  2. Step 2: Convert to fraction form
    301.78/452.37 = 139.42/x
  3. Step 3: Cross multiply
    301.78x = 452.37 × 139.42
  4. Step 4: Simplify right side
    301.78x = 63,069.43
  5. Step 5: Solve for x
    x = 63,069.43/301.78
  6. Step 6: Final answer
    x = 208.99

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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.