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Finding the Fourth Proportional to 45.55, 68.30 and 13.48

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Solution

The fourth proportional to 45.55, 68.30 and 13.48 is: 20.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.55 : 68.30 = 13.48 : x
  2. Step 2: Convert to fraction form
    45.55/68.30 = 13.48/x
  3. Step 3: Cross multiply
    45.55x = 68.30 × 13.48
  4. Step 4: Simplify right side
    45.55x = 920.34
  5. Step 5: Solve for x
    x = 920.34/45.55
  6. Step 6: Final answer
    x = 20.21

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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.