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Finding the Fourth Proportional to 13,872.66, 19,143.90 and 7,905.24

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Solution

The fourth proportional to 13,872.66, 19,143.90 and 7,905.24 is: 10,909.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,872.66 : 19,143.90 = 7,905.24 : x
  2. Step 2: Convert to fraction form
    13,872.66/19,143.90 = 7,905.24/x
  3. Step 3: Cross multiply
    13,872.66x = 19,143.90 × 7,905.24
  4. Step 4: Simplify right side
    13,872.66x = 151,337,124.04
  5. Step 5: Solve for x
    x = 151,337,124.04/13,872.66
  6. Step 6: Final answer
    x = 10,909.02

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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.