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Finding the Fourth Proportional to 1,379.14, 2,068.89 and 513.34

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Solution

The fourth proportional to 1,379.14, 2,068.89 and 513.34 is: 770.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,379.14 : 2,068.89 = 513.34 : x
  2. Step 2: Convert to fraction form
    1,379.14/2,068.89 = 513.34/x
  3. Step 3: Cross multiply
    1,379.14x = 2,068.89 × 513.34
  4. Step 4: Simplify right side
    1,379.14x = 1,062,043.99
  5. Step 5: Solve for x
    x = 1,062,043.99/1,379.14
  6. Step 6: Final answer
    x = 770.08

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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.