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Finding the Fourth Proportional to 1,207.88, 1,811.81 and 342.19

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Solution

The fourth proportional to 1,207.88, 1,811.81 and 342.19 is: 513.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,207.88 : 1,811.81 = 342.19 : x
  2. Step 2: Convert to fraction form
    1,207.88/1,811.81 = 342.19/x
  3. Step 3: Cross multiply
    1,207.88x = 1,811.81 × 342.19
  4. Step 4: Simplify right side
    1,207.88x = 619,979.59
  5. Step 5: Solve for x
    x = 619,979.59/1,207.88
  6. Step 6: Final answer
    x = 513.28

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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.