Home / 12,288.80-18,439.20-5,711.60

Finding the Fourth Proportional to 12,288.80, 18,439.20 and 5,711.60

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Solution

The fourth proportional to 12,288.80, 18,439.20 and 5,711.60 is: 8,570.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,288.80 : 18,439.20 = 5,711.60 : x
  2. Step 2: Convert to fraction form
    12,288.80/18,439.20 = 5,711.60/x
  3. Step 3: Cross multiply
    12,288.80x = 18,439.20 × 5,711.60
  4. Step 4: Simplify right side
    12,288.80x = 105,317,334.72
  5. Step 5: Solve for x
    x = 105,317,334.72/12,288.80
  6. Step 6: Final answer
    x = 8,570.19

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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.