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Finding the Fourth Proportional to 23.04, 31.74 and 20

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Solution

The fourth proportional to 23.04, 31.74 and 20 is: 27.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    23.04 : 31.74 = 20 : x
  2. Step 2: Convert to fraction form
    23.04/31.74 = 20/x
  3. Step 3: Cross multiply
    23.04x = 31.74 × 20
  4. Step 4: Simplify right side
    23.04x = 634.80
  5. Step 5: Solve for x
    x = 634.80/23.04
  6. Step 6: Final answer
    x = 27.55

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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.