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Finding the Fourth Proportional to 1,379.51, 2,068.56 and 513.21

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Solution

The fourth proportional to 1,379.51, 2,068.56 and 513.21 is: 769.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,379.51 : 2,068.56 = 513.21 : x
  2. Step 2: Convert to fraction form
    1,379.51/2,068.56 = 513.21/x
  3. Step 3: Cross multiply
    1,379.51x = 2,068.56 × 513.21
  4. Step 4: Simplify right side
    1,379.51x = 1,061,605.68
  5. Step 5: Solve for x
    x = 1,061,605.68/1,379.51
  6. Step 6: Final answer
    x = 769.56

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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.