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Finding the Fourth Proportional to 83,990.64, 125,985.84 and 28,586.64

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Solution

The fourth proportional to 83,990.64, 125,985.84 and 28,586.64 is: 42,879.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,990.64 : 125,985.84 = 28,586.64 : x
  2. Step 2: Convert to fraction form
    83,990.64/125,985.84 = 28,586.64/x
  3. Step 3: Cross multiply
    83,990.64x = 125,985.84 × 28,586.64
  4. Step 4: Simplify right side
    83,990.64x = 3,601,511,853.18
  5. Step 5: Solve for x
    x = 3,601,511,853.18/83,990.64
  6. Step 6: Final answer
    x = 42,879.92

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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.