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Finding the Fourth Proportional to 13,242, 19,863 and 3,381.28

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Solution

The fourth proportional to 13,242, 19,863 and 3,381.28 is: 5,071.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,242 : 19,863 = 3,381.28 : x
  2. Step 2: Convert to fraction form
    13,242/19,863 = 3,381.28/x
  3. Step 3: Cross multiply
    13,242x = 19,863 × 3,381.28
  4. Step 4: Simplify right side
    13,242x = 67,162,364.64
  5. Step 5: Solve for x
    x = 67,162,364.64/13,242
  6. Step 6: Final answer
    x = 5,071.92

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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.