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Finding the Fourth Proportional to 1,379.86, 2,068.57 and 513.56

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Solution

The fourth proportional to 1,379.86, 2,068.57 and 513.56 is: 769.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,379.86 : 2,068.57 = 513.56 : x
  2. Step 2: Convert to fraction form
    1,379.86/2,068.57 = 513.56/x
  3. Step 3: Cross multiply
    1,379.86x = 2,068.57 × 513.56
  4. Step 4: Simplify right side
    1,379.86x = 1,062,334.81
  5. Step 5: Solve for x
    x = 1,062,334.81/1,379.86
  6. Step 6: Final answer
    x = 769.89

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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.