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Finding the Fourth Proportional to 1,261.95, 1,892.89 and 384.45

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Solution

The fourth proportional to 1,261.95, 1,892.89 and 384.45 is: 576.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.95 : 1,892.89 = 384.45 : x
  2. Step 2: Convert to fraction form
    1,261.95/1,892.89 = 384.45/x
  3. Step 3: Cross multiply
    1,261.95x = 1,892.89 × 384.45
  4. Step 4: Simplify right side
    1,261.95x = 727,721.56
  5. Step 5: Solve for x
    x = 727,721.56/1,261.95
  6. Step 6: Final answer
    x = 576.66

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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.