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Finding the Fourth Proportional to 49.91, 68.90 and 30.50

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Solution

The fourth proportional to 49.91, 68.90 and 30.50 is: 42.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    49.91 : 68.90 = 30.50 : x
  2. Step 2: Convert to fraction form
    49.91/68.90 = 30.50/x
  3. Step 3: Cross multiply
    49.91x = 68.90 × 30.50
  4. Step 4: Simplify right side
    49.91x = 2,101.45
  5. Step 5: Solve for x
    x = 2,101.45/49.91
  6. Step 6: Final answer
    x = 42.10

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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.