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Finding the Fourth Proportional to 20.66, 28.47 and 15.19

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Solution

The fourth proportional to 20.66, 28.47 and 15.19 is: 20.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.66 : 28.47 = 15.19 : x
  2. Step 2: Convert to fraction form
    20.66/28.47 = 15.19/x
  3. Step 3: Cross multiply
    20.66x = 28.47 × 15.19
  4. Step 4: Simplify right side
    20.66x = 432.33
  5. Step 5: Solve for x
    x = 432.33/20.66
  6. Step 6: Final answer
    x = 20.93

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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.