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Finding the Fourth Proportional to 1,279.83, 1,920.21 and 414.15

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Solution

The fourth proportional to 1,279.83, 1,920.21 and 414.15 is: 621.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.83 : 1,920.21 = 414.15 : x
  2. Step 2: Convert to fraction form
    1,279.83/1,920.21 = 414.15/x
  3. Step 3: Cross multiply
    1,279.83x = 1,920.21 × 414.15
  4. Step 4: Simplify right side
    1,279.83x = 795,246.22
  5. Step 5: Solve for x
    x = 795,246.22/1,279.83
  6. Step 6: Final answer
    x = 621.37

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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.