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Finding the Fourth Proportional to 30.69, 45.98 and 20.54

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Solution

The fourth proportional to 30.69, 45.98 and 20.54 is: 30.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.69 : 45.98 = 20.54 : x
  2. Step 2: Convert to fraction form
    30.69/45.98 = 20.54/x
  3. Step 3: Cross multiply
    30.69x = 45.98 × 20.54
  4. Step 4: Simplify right side
    30.69x = 944.43
  5. Step 5: Solve for x
    x = 944.43/30.69
  6. Step 6: Final answer
    x = 30.77

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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.