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Finding the Fourth Proportional to 16.00, 21.87 and 15.53

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Solution

The fourth proportional to 16.00, 21.87 and 15.53 is: 21.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    16.00 : 21.87 = 15.53 : x
  2. Step 2: Convert to fraction form
    16.00/21.87 = 15.53/x
  3. Step 3: Cross multiply
    16.00x = 21.87 × 15.53
  4. Step 4: Simplify right side
    16.00x = 339.53
  5. Step 5: Solve for x
    x = 339.53/16.00
  6. Step 6: Final answer
    x = 21.22

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.