Home / 12,739.20-19,108.80-11,378.40

Finding the Fourth Proportional to 12,739.20, 19,108.80 and 11,378.40

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Solution

The fourth proportional to 12,739.20, 19,108.80 and 11,378.40 is: 17,067.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,739.20 : 19,108.80 = 11,378.40 : x
  2. Step 2: Convert to fraction form
    12,739.20/19,108.80 = 11,378.40/x
  3. Step 3: Cross multiply
    12,739.20x = 19,108.80 × 11,378.40
  4. Step 4: Simplify right side
    12,739.20x = 217,427,569.92
  5. Step 5: Solve for x
    x = 217,427,569.92/12,739.20
  6. Step 6: Final answer
    x = 17,067.60

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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.