Home / 1,209.70-1,811.76-1,189.63

Finding the Fourth Proportional to 1,209.70, 1,811.76 and 1,189.63

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Solution

The fourth proportional to 1,209.70, 1,811.76 and 1,189.63 is: 1,781.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209.70 : 1,811.76 = 1,189.63 : x
  2. Step 2: Convert to fraction form
    1,209.70/1,811.76 = 1,189.63/x
  3. Step 3: Cross multiply
    1,209.70x = 1,811.76 × 1,189.63
  4. Step 4: Simplify right side
    1,209.70x = 2,155,324.05
  5. Step 5: Solve for x
    x = 2,155,324.05/1,209.70
  6. Step 6: Final answer
    x = 1,781.70

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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.