Home / 1,207.91-1,811.70-386.30

Finding the Fourth Proportional to 1,207.91, 1,811.70 and 386.30

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Solution

The fourth proportional to 1,207.91, 1,811.70 and 386.30 is: 579.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,207.91 : 1,811.70 = 386.30 : x
  2. Step 2: Convert to fraction form
    1,207.91/1,811.70 = 386.30/x
  3. Step 3: Cross multiply
    1,207.91x = 1,811.70 × 386.30
  4. Step 4: Simplify right side
    1,207.91x = 699,864.24
  5. Step 5: Solve for x
    x = 699,864.24/1,207.91
  6. Step 6: Final answer
    x = 579.40

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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.