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Finding the Fourth Proportional to 1,292.87, 1,939.46 and 415.13

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Solution

The fourth proportional to 1,292.87, 1,939.46 and 415.13 is: 622.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,292.87 : 1,939.46 = 415.13 : x
  2. Step 2: Convert to fraction form
    1,292.87/1,939.46 = 415.13/x
  3. Step 3: Cross multiply
    1,292.87x = 1,939.46 × 415.13
  4. Step 4: Simplify right side
    1,292.87x = 805,116.26
  5. Step 5: Solve for x
    x = 805,116.26/1,292.87
  6. Step 6: Final answer
    x = 622.73

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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.