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Finding the Fourth Proportional to 31.11, 46.36 and 30.86

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Solution

The fourth proportional to 31.11, 46.36 and 30.86 is: 45.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.11 : 46.36 = 30.86 : x
  2. Step 2: Convert to fraction form
    31.11/46.36 = 30.86/x
  3. Step 3: Cross multiply
    31.11x = 46.36 × 30.86
  4. Step 4: Simplify right side
    31.11x = 1,430.67
  5. Step 5: Solve for x
    x = 1,430.67/31.11
  6. Step 6: Final answer
    x = 45.99

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.