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Finding the Fourth Proportional to 11.15, 15.35 and 10.00

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Solution

The fourth proportional to 11.15, 15.35 and 10.00 is: 13.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.15 : 15.35 = 10.00 : x
  2. Step 2: Convert to fraction form
    11.15/15.35 = 10.00/x
  3. Step 3: Cross multiply
    11.15x = 15.35 × 10.00
  4. Step 4: Simplify right side
    11.15x = 153.41
  5. Step 5: Solve for x
    x = 153.41/11.15
  6. Step 6: Final answer
    x = 13.77

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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.