Home / 9,120.42-13,680.90-5,424.12

Finding the Fourth Proportional to 9,120.42, 13,680.90 and 5,424.12

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Solution

The fourth proportional to 9,120.42, 13,680.90 and 5,424.12 is: 8,136.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,120.42 : 13,680.90 = 5,424.12 : x
  2. Step 2: Convert to fraction form
    9,120.42/13,680.90 = 5,424.12/x
  3. Step 3: Cross multiply
    9,120.42x = 13,680.90 × 5,424.12
  4. Step 4: Simplify right side
    9,120.42x = 74,206,843.31
  5. Step 5: Solve for x
    x = 74,206,843.31/9,120.42
  6. Step 6: Final answer
    x = 8,136.34

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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.