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Finding the Fourth Proportional to 8,570.89, 12,857.95 and 3,891.23

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Solution

The fourth proportional to 8,570.89, 12,857.95 and 3,891.23 is: 5,837.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,570.89 : 12,857.95 = 3,891.23 : x
  2. Step 2: Convert to fraction form
    8,570.89/12,857.95 = 3,891.23/x
  3. Step 3: Cross multiply
    8,570.89x = 12,857.95 × 3,891.23
  4. Step 4: Simplify right side
    8,570.89x = 50,033,221.32
  5. Step 5: Solve for x
    x = 50,033,221.32/8,570.89
  6. Step 6: Final answer
    x = 5,837.58

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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.