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Finding the Fourth Proportional to 1,262.80, 1,893.96 and 385.28

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Solution

The fourth proportional to 1,262.80, 1,893.96 and 385.28 is: 577.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,262.80 : 1,893.96 = 385.28 : x
  2. Step 2: Convert to fraction form
    1,262.80/1,893.96 = 385.28/x
  3. Step 3: Cross multiply
    1,262.80x = 1,893.96 × 385.28
  4. Step 4: Simplify right side
    1,262.80x = 729,704.91
  5. Step 5: Solve for x
    x = 729,704.91/1,262.80
  6. Step 6: Final answer
    x = 577.85

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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.