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Finding the Fourth Proportional to 1,380.12, 2,068.95 and 513.82

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Solution

The fourth proportional to 1,380.12, 2,068.95 and 513.82 is: 770.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.12 : 2,068.95 = 513.82 : x
  2. Step 2: Convert to fraction form
    1,380.12/2,068.95 = 513.82/x
  3. Step 3: Cross multiply
    1,380.12x = 2,068.95 × 513.82
  4. Step 4: Simplify right side
    1,380.12x = 1,063,067.89
  5. Step 5: Solve for x
    x = 1,063,067.89/1,380.12
  6. Step 6: Final answer
    x = 770.27

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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.