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Finding the Fourth Proportional to 1,261.66, 1,892.43 and 384.13

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Solution

The fourth proportional to 1,261.66, 1,892.43 and 384.13 is: 576.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.66 : 1,892.43 = 384.13 : x
  2. Step 2: Convert to fraction form
    1,261.66/1,892.43 = 384.13/x
  3. Step 3: Cross multiply
    1,261.66x = 1,892.43 × 384.13
  4. Step 4: Simplify right side
    1,261.66x = 726,939.14
  5. Step 5: Solve for x
    x = 726,939.14/1,261.66
  6. Step 6: Final answer
    x = 576.18

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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.