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Finding the Fourth Proportional to 11.18, 15.45 and 10.87

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Solution

The fourth proportional to 11.18, 15.45 and 10.87 is: 15.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.18 : 15.45 = 10.87 : x
  2. Step 2: Convert to fraction form
    11.18/15.45 = 10.87/x
  3. Step 3: Cross multiply
    11.18x = 15.45 × 10.87
  4. Step 4: Simplify right side
    11.18x = 167.81
  5. Step 5: Solve for x
    x = 167.81/11.18
  6. Step 6: Final answer
    x = 15.01

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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.