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Finding the Fourth Proportional to 29.68, 40.86 and 25.78

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Solution

The fourth proportional to 29.68, 40.86 and 25.78 is: 35.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    29.68 : 40.86 = 25.78 : x
  2. Step 2: Convert to fraction form
    29.68/40.86 = 25.78/x
  3. Step 3: Cross multiply
    29.68x = 40.86 × 25.78
  4. Step 4: Simplify right side
    29.68x = 1,053.37
  5. Step 5: Solve for x
    x = 1,053.37/29.68
  6. Step 6: Final answer
    x = 35.49

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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.