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Finding the Fourth Proportional to 12.98, 19.38 and 12.32

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Solution

The fourth proportional to 12.98, 19.38 and 12.32 is: 18.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    12.98 : 19.38 = 12.32 : x
  2. Step 2: Convert to fraction form
    12.98/19.38 = 12.32/x
  3. Step 3: Cross multiply
    12.98x = 19.38 × 12.32
  4. Step 4: Simplify right side
    12.98x = 238.76
  5. Step 5: Solve for x
    x = 238.76/12.98
  6. Step 6: Final answer
    x = 18.39

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.