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Finding the Fourth Proportional to 1,015.10, 1,521.92 and 685.22

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Solution

The fourth proportional to 1,015.10, 1,521.92 and 685.22 is: 1,027.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,015.10 : 1,521.92 = 685.22 : x
  2. Step 2: Convert to fraction form
    1,015.10/1,521.92 = 685.22/x
  3. Step 3: Cross multiply
    1,015.10x = 1,521.92 × 685.22
  4. Step 4: Simplify right side
    1,015.10x = 1,042,853.38
  5. Step 5: Solve for x
    x = 1,042,853.38/1,015.10
  6. Step 6: Final answer
    x = 1,027.34

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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.