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Finding the Fourth Proportional to 38.79, 58.18 and 13.12

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Solution

The fourth proportional to 38.79, 58.18 and 13.12 is: 19.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    38.79 : 58.18 = 13.12 : x
  2. Step 2: Convert to fraction form
    38.79/58.18 = 13.12/x
  3. Step 3: Cross multiply
    38.79x = 58.18 × 13.12
  4. Step 4: Simplify right side
    38.79x = 763.32
  5. Step 5: Solve for x
    x = 763.32/38.79
  6. Step 6: Final answer
    x = 19.68

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.