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Finding the Fourth Proportional to 1,080.21, 1,620.42 and 349.86

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Solution

The fourth proportional to 1,080.21, 1,620.42 and 349.86 is: 524.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,080.21 : 1,620.42 = 349.86 : x
  2. Step 2: Convert to fraction form
    1,080.21/1,620.42 = 349.86/x
  3. Step 3: Cross multiply
    1,080.21x = 1,620.42 × 349.86
  4. Step 4: Simplify right side
    1,080.21x = 566,920.14
  5. Step 5: Solve for x
    x = 566,920.14/1,080.21
  6. Step 6: Final answer
    x = 524.82

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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.