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Finding the Fourth Proportional to 14,979, 20,671.02 and 8,355

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Solution

The fourth proportional to 14,979, 20,671.02 and 8,355 is: 11,529.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,979 : 20,671.02 = 8,355 : x
  2. Step 2: Convert to fraction form
    14,979/20,671.02 = 8,355/x
  3. Step 3: Cross multiply
    14,979x = 20,671.02 × 8,355
  4. Step 4: Simplify right side
    14,979x = 172,706,372.10
  5. Step 5: Solve for x
    x = 172,706,372.10/14,979
  6. Step 6: Final answer
    x = 11,529.90

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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.