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Finding the Fourth Proportional to 1,261.86, 1,892.81 and 384.38

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Solution

The fourth proportional to 1,261.86, 1,892.81 and 384.38 is: 576.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.86 : 1,892.81 = 384.38 : x
  2. Step 2: Convert to fraction form
    1,261.86/1,892.81 = 384.38/x
  3. Step 3: Cross multiply
    1,261.86x = 1,892.81 × 384.38
  4. Step 4: Simplify right side
    1,261.86x = 727,558.31
  5. Step 5: Solve for x
    x = 727,558.31/1,261.86
  6. Step 6: Final answer
    x = 576.58

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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.