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Finding the Fourth Proportional to 7,251.60, 10,007.20 and 3,939.60

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Solution

The fourth proportional to 7,251.60, 10,007.20 and 3,939.60 is: 5,436.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,251.60 : 10,007.20 = 3,939.60 : x
  2. Step 2: Convert to fraction form
    7,251.60/10,007.20 = 3,939.60/x
  3. Step 3: Cross multiply
    7,251.60x = 10,007.20 × 3,939.60
  4. Step 4: Simplify right side
    7,251.60x = 39,424,365.12
  5. Step 5: Solve for x
    x = 39,424,365.12/7,251.60
  6. Step 6: Final answer
    x = 5,436.64

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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.