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Finding the Fourth Proportional to 1,208.49, 1,812.90 and 386.67

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Solution

The fourth proportional to 1,208.49, 1,812.90 and 386.67 is: 580.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,208.49 : 1,812.90 = 386.67 : x
  2. Step 2: Convert to fraction form
    1,208.49/1,812.90 = 386.67/x
  3. Step 3: Cross multiply
    1,208.49x = 1,812.90 × 386.67
  4. Step 4: Simplify right side
    1,208.49x = 700,994.04
  5. Step 5: Solve for x
    x = 700,994.04/1,208.49
  6. Step 6: Final answer
    x = 580.06

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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.