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Finding the Fourth Proportional to 12,689.87, 17,512.67 and 7,385.99

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Solution

The fourth proportional to 12,689.87, 17,512.67 and 7,385.99 is: 10,193.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,689.87 : 17,512.67 = 7,385.99 : x
  2. Step 2: Convert to fraction form
    12,689.87/17,512.67 = 7,385.99/x
  3. Step 3: Cross multiply
    12,689.87x = 17,512.67 × 7,385.99
  4. Step 4: Simplify right side
    12,689.87x = 129,348,336.39
  5. Step 5: Solve for x
    x = 129,348,336.39/12,689.87
  6. Step 6: Final answer
    x = 10,193.04

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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.