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Finding the Fourth Proportional to 20.35, 27.95 and 20.17

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Solution

The fourth proportional to 20.35, 27.95 and 20.17 is: 27.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.35 : 27.95 = 20.17 : x
  2. Step 2: Convert to fraction form
    20.35/27.95 = 20.17/x
  3. Step 3: Cross multiply
    20.35x = 27.95 × 20.17
  4. Step 4: Simplify right side
    20.35x = 563.65
  5. Step 5: Solve for x
    x = 563.65/20.35
  6. Step 6: Final answer
    x = 27.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.