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Finding the Fourth Proportional to 13.35, 18.43 and 9.90

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Solution

The fourth proportional to 13.35, 18.43 and 9.90 is: 13.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.35 : 18.43 = 9.90 : x
  2. Step 2: Convert to fraction form
    13.35/18.43 = 9.90/x
  3. Step 3: Cross multiply
    13.35x = 18.43 × 9.90
  4. Step 4: Simplify right side
    13.35x = 182.46
  5. Step 5: Solve for x
    x = 182.46/13.35
  6. Step 6: Final answer
    x = 13.67

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.