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Finding the Fourth Proportional to 40.72, 61 and 31.08

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Solution

The fourth proportional to 40.72, 61 and 31.08 is: 46.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.72 : 61 = 31.08 : x
  2. Step 2: Convert to fraction form
    40.72/61 = 31.08/x
  3. Step 3: Cross multiply
    40.72x = 61 × 31.08
  4. Step 4: Simplify right side
    40.72x = 1,895.88
  5. Step 5: Solve for x
    x = 1,895.88/40.72
  6. Step 6: Final answer
    x = 46.56

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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.