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Finding the Fourth Proportional to 1,261.72, 1,892.98 and 384.39

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Solution

The fourth proportional to 1,261.72, 1,892.98 and 384.39 is: 576.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.72 : 1,892.98 = 384.39 : x
  2. Step 2: Convert to fraction form
    1,261.72/1,892.98 = 384.39/x
  3. Step 3: Cross multiply
    1,261.72x = 1,892.98 × 384.39
  4. Step 4: Simplify right side
    1,261.72x = 727,646.27
  5. Step 5: Solve for x
    x = 727,646.27/1,261.72
  6. Step 6: Final answer
    x = 576.71

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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.