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Finding the Fourth Proportional to 35.72, 49.31 and 31.12

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Solution

The fourth proportional to 35.72, 49.31 and 31.12 is: 42.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    35.72 : 49.31 = 31.12 : x
  2. Step 2: Convert to fraction form
    35.72/49.31 = 31.12/x
  3. Step 3: Cross multiply
    35.72x = 49.31 × 31.12
  4. Step 4: Simplify right side
    35.72x = 1,534.53
  5. Step 5: Solve for x
    x = 1,534.53/35.72
  6. Step 6: Final answer
    x = 42.96

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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.