Home / 1,221.20-1,831.80-1,160.45

Finding the Fourth Proportional to 1,221.20, 1,831.80 and 1,160.45

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Solution

The fourth proportional to 1,221.20, 1,831.80 and 1,160.45 is: 1,740.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.20 : 1,831.80 = 1,160.45 : x
  2. Step 2: Convert to fraction form
    1,221.20/1,831.80 = 1,160.45/x
  3. Step 3: Cross multiply
    1,221.20x = 1,831.80 × 1,160.45
  4. Step 4: Simplify right side
    1,221.20x = 2,125,712.31
  5. Step 5: Solve for x
    x = 2,125,712.31/1,221.20
  6. Step 6: Final answer
    x = 1,740.68

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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.