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Finding the Fourth Proportional to 20.19, 27.87 and 11.57

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Solution

The fourth proportional to 20.19, 27.87 and 11.57 is: 15.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.19 : 27.87 = 11.57 : x
  2. Step 2: Convert to fraction form
    20.19/27.87 = 11.57/x
  3. Step 3: Cross multiply
    20.19x = 27.87 × 11.57
  4. Step 4: Simplify right side
    20.19x = 322.26
  5. Step 5: Solve for x
    x = 322.26/20.19
  6. Step 6: Final answer
    x = 15.96

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1.5x scale

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.