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Finding the Fourth Proportional to 1,429.13, 1,972.62 and 905.47

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Solution

The fourth proportional to 1,429.13, 1,972.62 and 905.47 is: 1,249.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,429.13 : 1,972.62 = 905.47 : x
  2. Step 2: Convert to fraction form
    1,429.13/1,972.62 = 905.47/x
  3. Step 3: Cross multiply
    1,429.13x = 1,972.62 × 905.47
  4. Step 4: Simplify right side
    1,429.13x = 1,786,143.30
  5. Step 5: Solve for x
    x = 1,786,143.30/1,429.13
  6. Step 6: Final answer
    x = 1,249.81

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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.