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Finding the Fourth Proportional to 40.74, 56.09 and 31.50

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Solution

The fourth proportional to 40.74, 56.09 and 31.50 is: 43.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.74 : 56.09 = 31.50 : x
  2. Step 2: Convert to fraction form
    40.74/56.09 = 31.50/x
  3. Step 3: Cross multiply
    40.74x = 56.09 × 31.50
  4. Step 4: Simplify right side
    40.74x = 1,766.68
  5. Step 5: Solve for x
    x = 1,766.68/40.74
  6. Step 6: Final answer
    x = 43.36

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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.