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Finding the Fourth Proportional to 80,644.64, 120,979.92 and 28,069.16

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Solution

The fourth proportional to 80,644.64, 120,979.92 and 28,069.16 is: 42,108.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,644.64 : 120,979.92 = 28,069.16 : x
  2. Step 2: Convert to fraction form
    80,644.64/120,979.92 = 28,069.16/x
  3. Step 3: Cross multiply
    80,644.64x = 120,979.92 × 28,069.16
  4. Step 4: Simplify right side
    80,644.64x = 3,395,804,731.27
  5. Step 5: Solve for x
    x = 3,395,804,731.27/80,644.64
  6. Step 6: Final answer
    x = 42,108.25

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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.