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Finding the Fourth Proportional to 1,603.65, 2,405.72 and 679.21

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Solution

The fourth proportional to 1,603.65, 2,405.72 and 679.21 is: 1,018.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,603.65 : 2,405.72 = 679.21 : x
  2. Step 2: Convert to fraction form
    1,603.65/2,405.72 = 679.21/x
  3. Step 3: Cross multiply
    1,603.65x = 2,405.72 × 679.21
  4. Step 4: Simplify right side
    1,603.65x = 1,633,977.05
  5. Step 5: Solve for x
    x = 1,633,977.05/1,603.65
  6. Step 6: Final answer
    x = 1,018.91

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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.