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Finding the Fourth Proportional to 30.34, 45.48 and 13.21

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Solution

The fourth proportional to 30.34, 45.48 and 13.21 is: 19.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.34 : 45.48 = 13.21 : x
  2. Step 2: Convert to fraction form
    30.34/45.48 = 13.21/x
  3. Step 3: Cross multiply
    30.34x = 45.48 × 13.21
  4. Step 4: Simplify right side
    30.34x = 600.56
  5. Step 5: Solve for x
    x = 600.56/30.34
  6. Step 6: Final answer
    x = 19.80

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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.