Home / 1,379.19-2,069.13-405.29

Finding the Fourth Proportional to 1,379.19, 2,069.13 and 405.29

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Solution

The fourth proportional to 1,379.19, 2,069.13 and 405.29 is: 608.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,379.19 : 2,069.13 = 405.29 : x
  2. Step 2: Convert to fraction form
    1,379.19/2,069.13 = 405.29/x
  3. Step 3: Cross multiply
    1,379.19x = 2,069.13 × 405.29
  4. Step 4: Simplify right side
    1,379.19x = 838,601.77
  5. Step 5: Solve for x
    x = 838,601.77/1,379.19
  6. Step 6: Final answer
    x = 608.04

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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.