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Finding the Fourth Proportional to 8,689.21, 12,974.53 and 6,914.29

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Solution

The fourth proportional to 8,689.21, 12,974.53 and 6,914.29 is: 10,324.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,689.21 : 12,974.53 = 6,914.29 : x
  2. Step 2: Convert to fraction form
    8,689.21/12,974.53 = 6,914.29/x
  3. Step 3: Cross multiply
    8,689.21x = 12,974.53 × 6,914.29
  4. Step 4: Simplify right side
    8,689.21x = 89,709,680.32
  5. Step 5: Solve for x
    x = 89,709,680.32/8,689.21
  6. Step 6: Final answer
    x = 10,324.26

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.