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Finding the Fourth Proportional to 1,207.90, 1,811.85 and 386.43

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Solution

The fourth proportional to 1,207.90, 1,811.85 and 386.43 is: 579.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,207.90 : 1,811.85 = 386.43 : x
  2. Step 2: Convert to fraction form
    1,207.90/1,811.85 = 386.43/x
  3. Step 3: Cross multiply
    1,207.90x = 1,811.85 × 386.43
  4. Step 4: Simplify right side
    1,207.90x = 700,153.20
  5. Step 5: Solve for x
    x = 700,153.20/1,207.90
  6. Step 6: Final answer
    x = 579.65

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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.