Home / 3,412.40-5,118.68-1,221.28

Finding the Fourth Proportional to 3,412.40, 5,118.68 and 1,221.28

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Solution

The fourth proportional to 3,412.40, 5,118.68 and 1,221.28 is: 1,831.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,412.40 : 5,118.68 = 1,221.28 : x
  2. Step 2: Convert to fraction form
    3,412.40/5,118.68 = 1,221.28/x
  3. Step 3: Cross multiply
    3,412.40x = 5,118.68 × 1,221.28
  4. Step 4: Simplify right side
    3,412.40x = 6,251,341.51
  5. Step 5: Solve for x
    x = 6,251,341.51/3,412.40
  6. Step 6: Final answer
    x = 1,831.95

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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.