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Finding the Fourth Proportional to 40.69, 60.90 and 31.98

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Solution

The fourth proportional to 40.69, 60.90 and 31.98 is: 47.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.69 : 60.90 = 31.98 : x
  2. Step 2: Convert to fraction form
    40.69/60.90 = 31.98/x
  3. Step 3: Cross multiply
    40.69x = 60.90 × 31.98
  4. Step 4: Simplify right side
    40.69x = 1,947.58
  5. Step 5: Solve for x
    x = 1,947.58/40.69
  6. Step 6: Final answer
    x = 47.86

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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.