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Finding the Fourth Proportional to 1,299.61, 1,791.34 and 905.95

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Solution

The fourth proportional to 1,299.61, 1,791.34 and 905.95 is: 1,248.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,299.61 : 1,791.34 = 905.95 : x
  2. Step 2: Convert to fraction form
    1,299.61/1,791.34 = 905.95/x
  3. Step 3: Cross multiply
    1,299.61x = 1,791.34 × 905.95
  4. Step 4: Simplify right side
    1,299.61x = 1,622,864.47
  5. Step 5: Solve for x
    x = 1,622,864.47/1,299.61
  6. Step 6: Final answer
    x = 1,248.73

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.