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Finding the Fourth Proportional to 3,693.60, 5,097.12 and 2,121.60

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Solution

The fourth proportional to 3,693.60, 5,097.12 and 2,121.60 is: 2,927.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,693.60 : 5,097.12 = 2,121.60 : x
  2. Step 2: Convert to fraction form
    3,693.60/5,097.12 = 2,121.60/x
  3. Step 3: Cross multiply
    3,693.60x = 5,097.12 × 2,121.60
  4. Step 4: Simplify right side
    3,693.60x = 10,814,049.79
  5. Step 5: Solve for x
    x = 10,814,049.79/3,693.60
  6. Step 6: Final answer
    x = 2,927.78

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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.