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Finding the Fourth Proportional to 1,221, 1,831.50 and 451.68

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Solution

The fourth proportional to 1,221, 1,831.50 and 451.68 is: 677.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221 : 1,831.50 = 451.68 : x
  2. Step 2: Convert to fraction form
    1,221/1,831.50 = 451.68/x
  3. Step 3: Cross multiply
    1,221x = 1,831.50 × 451.68
  4. Step 4: Simplify right side
    1,221x = 827,251.92
  5. Step 5: Solve for x
    x = 827,251.92/1,221
  6. Step 6: Final answer
    x = 677.52

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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.