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Finding the Fourth Proportional to 12,912.87, 17,819.95 and 12,465.90

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Solution

The fourth proportional to 12,912.87, 17,819.95 and 12,465.90 is: 17,203.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,912.87 : 17,819.95 = 12,465.90 : x
  2. Step 2: Convert to fraction form
    12,912.87/17,819.95 = 12,465.90/x
  3. Step 3: Cross multiply
    12,912.87x = 17,819.95 × 12,465.90
  4. Step 4: Simplify right side
    12,912.87x = 222,141,706.91
  5. Step 5: Solve for x
    x = 222,141,706.91/12,912.87
  6. Step 6: Final answer
    x = 17,203.13

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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.