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Finding the Fourth Proportional to 22.58, 31.18 and 19.86

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Solution

The fourth proportional to 22.58, 31.18 and 19.86 is: 27.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.58 : 31.18 = 19.86 : x
  2. Step 2: Convert to fraction form
    22.58/31.18 = 19.86/x
  3. Step 3: Cross multiply
    22.58x = 31.18 × 19.86
  4. Step 4: Simplify right side
    22.58x = 619.23
  5. Step 5: Solve for x
    x = 619.23/22.58
  6. Step 6: Final answer
    x = 27.42

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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.