Home / 12,990.14-19,485.17-3,129.40

Finding the Fourth Proportional to 12,990.14, 19,485.17 and 3,129.40

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Solution

The fourth proportional to 12,990.14, 19,485.17 and 3,129.40 is: 4,694.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,990.14 : 19,485.17 = 3,129.40 : x
  2. Step 2: Convert to fraction form
    12,990.14/19,485.17 = 3,129.40/x
  3. Step 3: Cross multiply
    12,990.14x = 19,485.17 × 3,129.40
  4. Step 4: Simplify right side
    12,990.14x = 60,976,891.00
  5. Step 5: Solve for x
    x = 60,976,891.00/12,990.14
  6. Step 6: Final answer
    x = 4,694.09

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.