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Finding the Fourth Proportional to 30.12, 45.20 and 13

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Solution

The fourth proportional to 30.12, 45.20 and 13 is: 19.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.12 : 45.20 = 13 : x
  2. Step 2: Convert to fraction form
    30.12/45.20 = 13/x
  3. Step 3: Cross multiply
    30.12x = 45.20 × 13
  4. Step 4: Simplify right side
    30.12x = 587.60
  5. Step 5: Solve for x
    x = 587.60/30.12
  6. Step 6: Final answer
    x = 19.51

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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.