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Finding the Fourth Proportional to 42.91, 64.41 and 25.81

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Solution

The fourth proportional to 42.91, 64.41 and 25.81 is: 38.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.91 : 64.41 = 25.81 : x
  2. Step 2: Convert to fraction form
    42.91/64.41 = 25.81/x
  3. Step 3: Cross multiply
    42.91x = 64.41 × 25.81
  4. Step 4: Simplify right side
    42.91x = 1,662.42
  5. Step 5: Solve for x
    x = 1,662.42/42.91
  6. Step 6: Final answer
    x = 38.74

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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.