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Finding the Fourth Proportional to 1,221.56, 1,831.76 and 734.48

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Solution

The fourth proportional to 1,221.56, 1,831.76 and 734.48 is: 1,101.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.56 : 1,831.76 = 734.48 : x
  2. Step 2: Convert to fraction form
    1,221.56/1,831.76 = 734.48/x
  3. Step 3: Cross multiply
    1,221.56x = 1,831.76 × 734.48
  4. Step 4: Simplify right side
    1,221.56x = 1,345,391.08
  5. Step 5: Solve for x
    x = 1,345,391.08/1,221.56
  6. Step 6: Final answer
    x = 1,101.37

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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.