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Finding the Fourth Proportional to 1,013.21, 1,520.22 and 397.36

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Solution

The fourth proportional to 1,013.21, 1,520.22 and 397.36 is: 596.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,013.21 : 1,520.22 = 397.36 : x
  2. Step 2: Convert to fraction form
    1,013.21/1,520.22 = 397.36/x
  3. Step 3: Cross multiply
    1,013.21x = 1,520.22 × 397.36
  4. Step 4: Simplify right side
    1,013.21x = 604,067.22
  5. Step 5: Solve for x
    x = 604,067.22/1,013.21
  6. Step 6: Final answer
    x = 596.19

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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.