Home / 13,578.12-20,339.46-6,990.47

Finding the Fourth Proportional to 13,578.12, 20,339.46 and 6,990.47

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Solution

The fourth proportional to 13,578.12, 20,339.46 and 6,990.47 is: 10,471.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,578.12 : 20,339.46 = 6,990.47 : x
  2. Step 2: Convert to fraction form
    13,578.12/20,339.46 = 6,990.47/x
  3. Step 3: Cross multiply
    13,578.12x = 20,339.46 × 6,990.47
  4. Step 4: Simplify right side
    13,578.12x = 142,182,283.25
  5. Step 5: Solve for x
    x = 142,182,283.25/13,578.12
  6. Step 6: Final answer
    x = 10,471.43

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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.