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Finding the Fourth Proportional to 1,221.75, 1,831.41 and 571.32

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Solution

The fourth proportional to 1,221.75, 1,831.41 and 571.32 is: 856.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.75 : 1,831.41 = 571.32 : x
  2. Step 2: Convert to fraction form
    1,221.75/1,831.41 = 571.32/x
  3. Step 3: Cross multiply
    1,221.75x = 1,831.41 × 571.32
  4. Step 4: Simplify right side
    1,221.75x = 1,046,321.16
  5. Step 5: Solve for x
    x = 1,046,321.16/1,221.75
  6. Step 6: Final answer
    x = 856.41

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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.