Home / 285,540.20-428,310.30-85,891.40

Finding the Fourth Proportional to 285,540.20, 428,310.30 and 85,891.40

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Solution

The fourth proportional to 285,540.20, 428,310.30 and 85,891.40 is: 128,837.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,540.20 : 428,310.30 = 85,891.40 : x
  2. Step 2: Convert to fraction form
    285,540.20/428,310.30 = 85,891.40/x
  3. Step 3: Cross multiply
    285,540.20x = 428,310.30 × 85,891.40
  4. Step 4: Simplify right side
    285,540.20x = 36,788,171,301.42
  5. Step 5: Solve for x
    x = 36,788,171,301.42/285,540.20
  6. Step 6: Final answer
    x = 128,837.10

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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.