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Finding the Fourth Proportional to 1,907.69, 2,860.25 and 919.96

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Solution

The fourth proportional to 1,907.69, 2,860.25 and 919.96 is: 1,379.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,907.69 : 2,860.25 = 919.96 : x
  2. Step 2: Convert to fraction form
    1,907.69/2,860.25 = 919.96/x
  3. Step 3: Cross multiply
    1,907.69x = 2,860.25 × 919.96
  4. Step 4: Simplify right side
    1,907.69x = 2,631,303.84
  5. Step 5: Solve for x
    x = 2,631,303.84/1,907.69
  6. Step 6: Final answer
    x = 1,379.32

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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.