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Finding the Fourth Proportional to 29.61, 40.74 and 28.81

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Solution

The fourth proportional to 29.61, 40.74 and 28.81 is: 39.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    29.61 : 40.74 = 28.81 : x
  2. Step 2: Convert to fraction form
    29.61/40.74 = 28.81/x
  3. Step 3: Cross multiply
    29.61x = 40.74 × 28.81
  4. Step 4: Simplify right side
    29.61x = 1,173.37
  5. Step 5: Solve for x
    x = 1,173.37/29.61
  6. Step 6: Final answer
    x = 39.63

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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.