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Finding the Fourth Proportional to 1,208.62, 1,812.37 and 386.71

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Solution

The fourth proportional to 1,208.62, 1,812.37 and 386.71 is: 579.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,208.62 : 1,812.37 = 386.71 : x
  2. Step 2: Convert to fraction form
    1,208.62/1,812.37 = 386.71/x
  3. Step 3: Cross multiply
    1,208.62x = 1,812.37 × 386.71
  4. Step 4: Simplify right side
    1,208.62x = 700,861.60
  5. Step 5: Solve for x
    x = 700,861.60/1,208.62
  6. Step 6: Final answer
    x = 579.89

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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.