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Finding the Fourth Proportional to 10.87, 16.20 and 10.15

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Solution

The fourth proportional to 10.87, 16.20 and 10.15 is: 15.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.87 : 16.20 = 10.15 : x
  2. Step 2: Convert to fraction form
    10.87/16.20 = 10.15/x
  3. Step 3: Cross multiply
    10.87x = 16.20 × 10.15
  4. Step 4: Simplify right side
    10.87x = 164.43
  5. Step 5: Solve for x
    x = 164.43/10.87
  6. Step 6: Final answer
    x = 15.13

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.