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Finding the Fourth Proportional to 78,479.98, 117,793.96 and 28,608.28

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Solution

The fourth proportional to 78,479.98, 117,793.96 and 28,608.28 is: 42,939.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,479.98 : 117,793.96 = 28,608.28 : x
  2. Step 2: Convert to fraction form
    78,479.98/117,793.96 = 28,608.28/x
  3. Step 3: Cross multiply
    78,479.98x = 117,793.96 × 28,608.28
  4. Step 4: Simplify right side
    78,479.98x = 3,369,882,589.99
  5. Step 5: Solve for x
    x = 3,369,882,589.99/78,479.98
  6. Step 6: Final answer
    x = 42,939.39

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1.5x scale

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.