Home / 12,890.40-19,335.60-12,760.80

Finding the Fourth Proportional to 12,890.40, 19,335.60 and 12,760.80

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Solution

The fourth proportional to 12,890.40, 19,335.60 and 12,760.80 is: 19,141.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,890.40 : 19,335.60 = 12,760.80 : x
  2. Step 2: Convert to fraction form
    12,890.40/19,335.60 = 12,760.80/x
  3. Step 3: Cross multiply
    12,890.40x = 19,335.60 × 12,760.80
  4. Step 4: Simplify right side
    12,890.40x = 246,737,724.48
  5. Step 5: Solve for x
    x = 246,737,724.48/12,890.40
  6. Step 6: Final answer
    x = 19,141.20

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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.