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Finding the Fourth Proportional to 15.76, 21.75 and 13.84

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Solution

The fourth proportional to 15.76, 21.75 and 13.84 is: 19.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.76 : 21.75 = 13.84 : x
  2. Step 2: Convert to fraction form
    15.76/21.75 = 13.84/x
  3. Step 3: Cross multiply
    15.76x = 21.75 × 13.84
  4. Step 4: Simplify right side
    15.76x = 301.02
  5. Step 5: Solve for x
    x = 301.02/15.76
  6. Step 6: Final answer
    x = 19.10

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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.