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Finding the Fourth Proportional to 995.20, 1,490.38 and 859.12

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Solution

The fourth proportional to 995.20, 1,490.38 and 859.12 is: 1,286.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    995.20 : 1,490.38 = 859.12 : x
  2. Step 2: Convert to fraction form
    995.20/1,490.38 = 859.12/x
  3. Step 3: Cross multiply
    995.20x = 1,490.38 × 859.12
  4. Step 4: Simplify right side
    995.20x = 1,280,414.70
  5. Step 5: Solve for x
    x = 1,280,414.70/995.20
  6. Step 6: Final answer
    x = 1,286.59

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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.