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Finding the Fourth Proportional to 12,689.30, 17,505.04 and 8,216.88

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Solution

The fourth proportional to 12,689.30, 17,505.04 and 8,216.88 is: 11,335.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,689.30 : 17,505.04 = 8,216.88 : x
  2. Step 2: Convert to fraction form
    12,689.30/17,505.04 = 8,216.88/x
  3. Step 3: Cross multiply
    12,689.30x = 17,505.04 × 8,216.88
  4. Step 4: Simplify right side
    12,689.30x = 143,836,813.08
  5. Step 5: Solve for x
    x = 143,836,813.08/12,689.30
  6. Step 6: Final answer
    x = 11,335.28

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.