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Finding the Fourth Proportional to 45, 67.46 and 20.91

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Solution

The fourth proportional to 45, 67.46 and 20.91 is: 31.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    45 : 67.46 = 20.91 : x
  2. Step 2: Convert to fraction form
    45/67.46 = 20.91/x
  3. Step 3: Cross multiply
    45x = 67.46 × 20.91
  4. Step 4: Simplify right side
    45x = 1,410.48
  5. Step 5: Solve for x
    x = 1,410.48/45
  6. Step 6: Final answer
    x = 31.34

Related Problems

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.