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Finding the Fourth Proportional to 1,207.91, 1,812.07 and 386.12

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Solution

The fourth proportional to 1,207.91, 1,812.07 and 386.12 is: 579.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,207.91 : 1,812.07 = 386.12 : x
  2. Step 2: Convert to fraction form
    1,207.91/1,812.07 = 386.12/x
  3. Step 3: Cross multiply
    1,207.91x = 1,812.07 × 386.12
  4. Step 4: Simplify right side
    1,207.91x = 699,681.48
  5. Step 5: Solve for x
    x = 699,681.48/1,207.91
  6. Step 6: Final answer
    x = 579.25

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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.