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Finding the Fourth Proportional to 28,979, 39,991.52 and 15,731

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Solution

The fourth proportional to 28,979, 39,991.52 and 15,731 is: 21,709.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,979 : 39,991.52 = 15,731 : x
  2. Step 2: Convert to fraction form
    28,979/39,991.52 = 15,731/x
  3. Step 3: Cross multiply
    28,979x = 39,991.52 × 15,731
  4. Step 4: Simplify right side
    28,979x = 629,106,601.12
  5. Step 5: Solve for x
    x = 629,106,601.12/28,979
  6. Step 6: Final answer
    x = 21,709.05

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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.