Home / 1,405.13-2,107.69-379.13

Finding the Fourth Proportional to 1,405.13, 2,107.69 and 379.13

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Solution

The fourth proportional to 1,405.13, 2,107.69 and 379.13 is: 568.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405.13 : 2,107.69 = 379.13 : x
  2. Step 2: Convert to fraction form
    1,405.13/2,107.69 = 379.13/x
  3. Step 3: Cross multiply
    1,405.13x = 2,107.69 × 379.13
  4. Step 4: Simplify right side
    1,405.13x = 799,077.02
  5. Step 5: Solve for x
    x = 799,077.02/1,405.13
  6. Step 6: Final answer
    x = 568.69

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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.