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Finding the Fourth Proportional to 49.63, 68.50 and 31.21

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Solution

The fourth proportional to 49.63, 68.50 and 31.21 is: 43.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    49.63 : 68.50 = 31.21 : x
  2. Step 2: Convert to fraction form
    49.63/68.50 = 31.21/x
  3. Step 3: Cross multiply
    49.63x = 68.50 × 31.21
  4. Step 4: Simplify right side
    49.63x = 2,137.66
  5. Step 5: Solve for x
    x = 2,137.66/49.63
  6. Step 6: Final answer
    x = 43.07

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.