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Finding the Fourth Proportional to 14.32, 21.50 and 11.80

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Solution

The fourth proportional to 14.32, 21.50 and 11.80 is: 17.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    14.32 : 21.50 = 11.80 : x
  2. Step 2: Convert to fraction form
    14.32/21.50 = 11.80/x
  3. Step 3: Cross multiply
    14.32x = 21.50 × 11.80
  4. Step 4: Simplify right side
    14.32x = 253.70
  5. Step 5: Solve for x
    x = 253.70/14.32
  6. Step 6: Final answer
    x = 17.72

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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.