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Finding the Fourth Proportional to 40.65, 56.13 and 31.41

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Solution

The fourth proportional to 40.65, 56.13 and 31.41 is: 43.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.65 : 56.13 = 31.41 : x
  2. Step 2: Convert to fraction form
    40.65/56.13 = 31.41/x
  3. Step 3: Cross multiply
    40.65x = 56.13 × 31.41
  4. Step 4: Simplify right side
    40.65x = 1,763.04
  5. Step 5: Solve for x
    x = 1,763.04/40.65
  6. Step 6: Final answer
    x = 43.37

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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.