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Finding the Fourth Proportional to 1,379.00, 2,068.83 and 405.09

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Solution

The fourth proportional to 1,379.00, 2,068.83 and 405.09 is: 607.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,379.00 : 2,068.83 = 405.09 : x
  2. Step 2: Convert to fraction form
    1,379.00/2,068.83 = 405.09/x
  3. Step 3: Cross multiply
    1,379.00x = 2,068.83 × 405.09
  4. Step 4: Simplify right side
    1,379.00x = 838,062.34
  5. Step 5: Solve for x
    x = 838,062.34/1,379.00
  6. Step 6: Final answer
    x = 607.73

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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.