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Finding the Fourth Proportional to 1,208.15, 1,812.26 and 342.47

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Solution

The fourth proportional to 1,208.15, 1,812.26 and 342.47 is: 513.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,208.15 : 1,812.26 = 342.47 : x
  2. Step 2: Convert to fraction form
    1,208.15/1,812.26 = 342.47/x
  3. Step 3: Cross multiply
    1,208.15x = 1,812.26 × 342.47
  4. Step 4: Simplify right side
    1,208.15x = 620,642.97
  5. Step 5: Solve for x
    x = 620,642.97/1,208.15
  6. Step 6: Final answer
    x = 513.71

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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.