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Finding the Fourth Proportional to 7,210.64, 10,815.02 and 2,831.20

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Solution

The fourth proportional to 7,210.64, 10,815.02 and 2,831.20 is: 4,246.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,210.64 : 10,815.02 = 2,831.20 : x
  2. Step 2: Convert to fraction form
    7,210.64/10,815.02 = 2,831.20/x
  3. Step 3: Cross multiply
    7,210.64x = 10,815.02 × 2,831.20
  4. Step 4: Simplify right side
    7,210.64x = 30,619,484.62
  5. Step 5: Solve for x
    x = 30,619,484.62/7,210.64
  6. Step 6: Final answer
    x = 4,246.43

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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.