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Finding the Fourth Proportional to 14.35, 19.79 and 12.80

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Solution

The fourth proportional to 14.35, 19.79 and 12.80 is: 17.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    14.35 : 19.79 = 12.80 : x
  2. Step 2: Convert to fraction form
    14.35/19.79 = 12.80/x
  3. Step 3: Cross multiply
    14.35x = 19.79 × 12.80
  4. Step 4: Simplify right side
    14.35x = 253.31
  5. Step 5: Solve for x
    x = 253.31/14.35
  6. Step 6: Final answer
    x = 17.65

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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.