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Finding the Fourth Proportional to 8,940.80, 12,342.04 and 5,403.12

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Solution

The fourth proportional to 8,940.80, 12,342.04 and 5,403.12 is: 7,458.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,940.80 : 12,342.04 = 5,403.12 : x
  2. Step 2: Convert to fraction form
    8,940.80/12,342.04 = 5,403.12/x
  3. Step 3: Cross multiply
    8,940.80x = 12,342.04 × 5,403.12
  4. Step 4: Simplify right side
    8,940.80x = 66,685,523.16
  5. Step 5: Solve for x
    x = 66,685,523.16/8,940.80
  6. Step 6: Final answer
    x = 7,458.56

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.