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Finding the Fourth Proportional to 1,013.98, 1,520.91 and 397.80

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Solution

The fourth proportional to 1,013.98, 1,520.91 and 397.80 is: 596.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,013.98 : 1,520.91 = 397.80 : x
  2. Step 2: Convert to fraction form
    1,013.98/1,520.91 = 397.80/x
  3. Step 3: Cross multiply
    1,013.98x = 1,520.91 × 397.80
  4. Step 4: Simplify right side
    1,013.98x = 605,018.00
  5. Step 5: Solve for x
    x = 605,018.00/1,013.98
  6. Step 6: Final answer
    x = 596.68

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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.