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Finding the Fourth Proportional to 1,380.22, 2,070.15 and 513.88

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Solution

The fourth proportional to 1,380.22, 2,070.15 and 513.88 is: 770.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.22 : 2,070.15 = 513.88 : x
  2. Step 2: Convert to fraction form
    1,380.22/2,070.15 = 513.88/x
  3. Step 3: Cross multiply
    1,380.22x = 2,070.15 × 513.88
  4. Step 4: Simplify right side
    1,380.22x = 1,063,808.68
  5. Step 5: Solve for x
    x = 1,063,808.68/1,380.22
  6. Step 6: Final answer
    x = 770.75

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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.