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Finding the Fourth Proportional to 12,693.58, 17,511.15 and 8,218.78

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Solution

The fourth proportional to 12,693.58, 17,511.15 and 8,218.78 is: 11,338.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,693.58 : 17,511.15 = 8,218.78 : x
  2. Step 2: Convert to fraction form
    12,693.58/17,511.15 = 8,218.78/x
  3. Step 3: Cross multiply
    12,693.58x = 17,511.15 × 8,218.78
  4. Step 4: Simplify right side
    12,693.58x = 143,920,289.40
  5. Step 5: Solve for x
    x = 143,920,289.40/12,693.58
  6. Step 6: Final answer
    x = 11,338.04

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Half scale
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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.