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Finding the Fourth Proportional to 15.93, 21.87 and 15.42

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Solution

The fourth proportional to 15.93, 21.87 and 15.42 is: 21.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.93 : 21.87 = 15.42 : x
  2. Step 2: Convert to fraction form
    15.93/21.87 = 15.42/x
  3. Step 3: Cross multiply
    15.93x = 21.87 × 15.42
  4. Step 4: Simplify right side
    15.93x = 337.24
  5. Step 5: Solve for x
    x = 337.24/15.93
  6. Step 6: Final answer
    x = 21.17

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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.