Home / 2,191.64-3,281.70-1,212.80

Finding the Fourth Proportional to 2,191.64, 3,281.70 and 1,212.80

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Solution

The fourth proportional to 2,191.64, 3,281.70 and 1,212.80 is: 1,816.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,191.64 : 3,281.70 = 1,212.80 : x
  2. Step 2: Convert to fraction form
    2,191.64/3,281.70 = 1,212.80/x
  3. Step 3: Cross multiply
    2,191.64x = 3,281.70 × 1,212.80
  4. Step 4: Simplify right side
    2,191.64x = 3,980,045.76
  5. Step 5: Solve for x
    x = 3,980,045.76/2,191.64
  6. Step 6: Final answer
    x = 1,816.01

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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.