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Finding the Fourth Proportional to 29.81, 40.57 and 29.68

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Solution

The fourth proportional to 29.81, 40.57 and 29.68 is: 40.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    29.81 : 40.57 = 29.68 : x
  2. Step 2: Convert to fraction form
    29.81/40.57 = 29.68/x
  3. Step 3: Cross multiply
    29.81x = 40.57 × 29.68
  4. Step 4: Simplify right side
    29.81x = 1,204.12
  5. Step 5: Solve for x
    x = 1,204.12/29.81
  6. Step 6: Final answer
    x = 40.39

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.