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Finding the Fourth Proportional to 31.19, 43.03 and 18.90

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Solution

The fourth proportional to 31.19, 43.03 and 18.90 is: 26.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.19 : 43.03 = 18.90 : x
  2. Step 2: Convert to fraction form
    31.19/43.03 = 18.90/x
  3. Step 3: Cross multiply
    31.19x = 43.03 × 18.90
  4. Step 4: Simplify right side
    31.19x = 813.27
  5. Step 5: Solve for x
    x = 813.27/31.19
  6. Step 6: Final answer
    x = 26.07

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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.