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Finding the Fourth Proportional to 50.81, 70.09 and 31.13

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Solution

The fourth proportional to 50.81, 70.09 and 31.13 is: 42.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    50.81 : 70.09 = 31.13 : x
  2. Step 2: Convert to fraction form
    50.81/70.09 = 31.13/x
  3. Step 3: Cross multiply
    50.81x = 70.09 × 31.13
  4. Step 4: Simplify right side
    50.81x = 2,181.90
  5. Step 5: Solve for x
    x = 2,181.90/50.81
  6. Step 6: Final answer
    x = 42.94

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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.