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Finding the Fourth Proportional to 31.06, 42.87 and 23.31

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Solution

The fourth proportional to 31.06, 42.87 and 23.31 is: 32.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.06 : 42.87 = 23.31 : x
  2. Step 2: Convert to fraction form
    31.06/42.87 = 23.31/x
  3. Step 3: Cross multiply
    31.06x = 42.87 × 23.31
  4. Step 4: Simplify right side
    31.06x = 999.18
  5. Step 5: Solve for x
    x = 999.18/31.06
  6. Step 6: Final answer
    x = 32.17

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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.