Home / 3,412.20-5,118.30-1,221.10

Finding the Fourth Proportional to 3,412.20, 5,118.30 and 1,221.10

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Solution

The fourth proportional to 3,412.20, 5,118.30 and 1,221.10 is: 1,831.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,412.20 : 5,118.30 = 1,221.10 : x
  2. Step 2: Convert to fraction form
    3,412.20/5,118.30 = 1,221.10/x
  3. Step 3: Cross multiply
    3,412.20x = 5,118.30 × 1,221.10
  4. Step 4: Simplify right side
    3,412.20x = 6,249,956.13
  5. Step 5: Solve for x
    x = 6,249,956.13/3,412.20
  6. Step 6: Final answer
    x = 1,831.65

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Double scale
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Similar ratio
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1.5x scale

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.