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Finding the Fourth Proportional to 1,208.81, 1,812.90 and 386.66

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Solution

The fourth proportional to 1,208.81, 1,812.90 and 386.66 is: 579.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,208.81 : 1,812.90 = 386.66 : x
  2. Step 2: Convert to fraction form
    1,208.81/1,812.90 = 386.66/x
  3. Step 3: Cross multiply
    1,208.81x = 1,812.90 × 386.66
  4. Step 4: Simplify right side
    1,208.81x = 700,981.90
  5. Step 5: Solve for x
    x = 700,981.90/1,208.81
  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.