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Finding the Fourth Proportional to 1,013.44, 1,518.91 and 428.22

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Solution

The fourth proportional to 1,013.44, 1,518.91 and 428.22 is: 641.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,013.44 : 1,518.91 = 428.22 : x
  2. Step 2: Convert to fraction form
    1,013.44/1,518.91 = 428.22/x
  3. Step 3: Cross multiply
    1,013.44x = 1,518.91 × 428.22
  4. Step 4: Simplify right side
    1,013.44x = 650,427.64
  5. Step 5: Solve for x
    x = 650,427.64/1,013.44
  6. Step 6: Final answer
    x = 641.80

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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.