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Finding the Fourth Proportional to 20.94, 31.40 and 7.43

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Solution

The fourth proportional to 20.94, 31.40 and 7.43 is: 11.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.94 : 31.40 = 7.43 : x
  2. Step 2: Convert to fraction form
    20.94/31.40 = 7.43/x
  3. Step 3: Cross multiply
    20.94x = 31.40 × 7.43
  4. Step 4: Simplify right side
    20.94x = 233.19
  5. Step 5: Solve for x
    x = 233.19/20.94
  6. Step 6: Final answer
    x = 11.13

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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.