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Finding the Fourth Proportional to 31.86, 43.95 and 26.40

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Solution

The fourth proportional to 31.86, 43.95 and 26.40 is: 36.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.86 : 43.95 = 26.40 : x
  2. Step 2: Convert to fraction form
    31.86/43.95 = 26.40/x
  3. Step 3: Cross multiply
    31.86x = 43.95 × 26.40
  4. Step 4: Simplify right side
    31.86x = 1,160.28
  5. Step 5: Solve for x
    x = 1,160.28/31.86
  6. Step 6: Final answer
    x = 36.42

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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.