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Finding the Fourth Proportional to 30.68, 46.05 and 20

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Solution

The fourth proportional to 30.68, 46.05 and 20 is: 30.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.68 : 46.05 = 20 : x
  2. Step 2: Convert to fraction form
    30.68/46.05 = 20/x
  3. Step 3: Cross multiply
    30.68x = 46.05 × 20
  4. Step 4: Simplify right side
    30.68x = 921
  5. Step 5: Solve for x
    x = 921/30.68
  6. Step 6: Final answer
    x = 30.02

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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.