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Finding the Fourth Proportional to 18.58, 25.58 and 13.72

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Solution

The fourth proportional to 18.58, 25.58 and 13.72 is: 18.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.58 : 25.58 = 13.72 : x
  2. Step 2: Convert to fraction form
    18.58/25.58 = 13.72/x
  3. Step 3: Cross multiply
    18.58x = 25.58 × 13.72
  4. Step 4: Simplify right side
    18.58x = 350.96
  5. Step 5: Solve for x
    x = 350.96/18.58
  6. Step 6: Final answer
    x = 18.89

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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.