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Finding the Fourth Proportional to 301.90, 452.91 and 139.63

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Solution

The fourth proportional to 301.90, 452.91 and 139.63 is: 209.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    301.90 : 452.91 = 139.63 : x
  2. Step 2: Convert to fraction form
    301.90/452.91 = 139.63/x
  3. Step 3: Cross multiply
    301.90x = 452.91 × 139.63
  4. Step 4: Simplify right side
    301.90x = 63,239.82
  5. Step 5: Solve for x
    x = 63,239.82/301.90
  6. Step 6: Final answer
    x = 209.47

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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.