Home / 1,207.72-1,811.55-386.05

Finding the Fourth Proportional to 1,207.72, 1,811.55 and 386.05

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Solution

The fourth proportional to 1,207.72, 1,811.55 and 386.05 is: 579.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,207.72 : 1,811.55 = 386.05 : x
  2. Step 2: Convert to fraction form
    1,207.72/1,811.55 = 386.05/x
  3. Step 3: Cross multiply
    1,207.72x = 1,811.55 × 386.05
  4. Step 4: Simplify right side
    1,207.72x = 699,348.88
  5. Step 5: Solve for x
    x = 699,348.88/1,207.72
  6. Step 6: Final answer
    x = 579.07

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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.