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Finding the Fourth Proportional to 301.76, 452.79 and 139.42

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Solution

The fourth proportional to 301.76, 452.79 and 139.42 is: 209.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    301.76 : 452.79 = 139.42 : x
  2. Step 2: Convert to fraction form
    301.76/452.79 = 139.42/x
  3. Step 3: Cross multiply
    301.76x = 452.79 × 139.42
  4. Step 4: Simplify right side
    301.76x = 63,128.55
  5. Step 5: Solve for x
    x = 63,128.55/301.76
  6. Step 6: Final answer
    x = 209.20

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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.