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Finding the Fourth Proportional to 1,261.59, 1,892.39 and 384.09

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Solution

The fourth proportional to 1,261.59, 1,892.39 and 384.09 is: 576.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.59 : 1,892.39 = 384.09 : x
  2. Step 2: Convert to fraction form
    1,261.59/1,892.39 = 384.09/x
  3. Step 3: Cross multiply
    1,261.59x = 1,892.39 × 384.09
  4. Step 4: Simplify right side
    1,261.59x = 726,846.15
  5. Step 5: Solve for x
    x = 726,846.15/1,261.59
  6. Step 6: Final answer
    x = 576.14

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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.