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Finding the Fourth Proportional to 1,262.90, 1,893.81 and 397.28

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Solution

The fourth proportional to 1,262.90, 1,893.81 and 397.28 is: 595.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,262.90 : 1,893.81 = 397.28 : x
  2. Step 2: Convert to fraction form
    1,262.90/1,893.81 = 397.28/x
  3. Step 3: Cross multiply
    1,262.90x = 1,893.81 × 397.28
  4. Step 4: Simplify right side
    1,262.90x = 752,372.84
  5. Step 5: Solve for x
    x = 752,372.84/1,262.90
  6. Step 6: Final answer
    x = 595.75

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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.