Home / 12,731.20-19,096.80-7,806.40

Finding the Fourth Proportional to 12,731.20, 19,096.80 and 7,806.40

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Solution

The fourth proportional to 12,731.20, 19,096.80 and 7,806.40 is: 11,709.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,731.20 : 19,096.80 = 7,806.40 : x
  2. Step 2: Convert to fraction form
    12,731.20/19,096.80 = 7,806.40/x
  3. Step 3: Cross multiply
    12,731.20x = 19,096.80 × 7,806.40
  4. Step 4: Simplify right side
    12,731.20x = 149,077,259.52
  5. Step 5: Solve for x
    x = 149,077,259.52/12,731.20
  6. Step 6: Final answer
    x = 11,709.60

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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.