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Finding the Fourth Proportional to 1,279.02, 1,918.49 and 401.52

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Solution

The fourth proportional to 1,279.02, 1,918.49 and 401.52 is: 602.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.02 : 1,918.49 = 401.52 : x
  2. Step 2: Convert to fraction form
    1,279.02/1,918.49 = 401.52/x
  3. Step 3: Cross multiply
    1,279.02x = 1,918.49 × 401.52
  4. Step 4: Simplify right side
    1,279.02x = 770,310.10
  5. Step 5: Solve for x
    x = 770,310.10/1,279.02
  6. Step 6: Final answer
    x = 602.27

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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.