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Finding the Fourth Proportional to 30.70, 46.08 and 20.58

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Solution

The fourth proportional to 30.70, 46.08 and 20.58 is: 30.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.70 : 46.08 = 20.58 : x
  2. Step 2: Convert to fraction form
    30.70/46.08 = 20.58/x
  3. Step 3: Cross multiply
    30.70x = 46.08 × 20.58
  4. Step 4: Simplify right side
    30.70x = 948.33
  5. Step 5: Solve for x
    x = 948.33/30.70
  6. Step 6: Final answer
    x = 30.89

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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.