Home / 3,120.75-4,681.13-1,272.87

Finding the Fourth Proportional to 3,120.75, 4,681.13 and 1,272.87

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Solution

The fourth proportional to 3,120.75, 4,681.13 and 1,272.87 is: 1,909.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,120.75 : 4,681.13 = 1,272.87 : x
  2. Step 2: Convert to fraction form
    3,120.75/4,681.13 = 1,272.87/x
  3. Step 3: Cross multiply
    3,120.75x = 4,681.13 × 1,272.87
  4. Step 4: Simplify right side
    3,120.75x = 5,958,463.58
  5. Step 5: Solve for x
    x = 5,958,463.58/3,120.75
  6. Step 6: Final answer
    x = 1,909.31

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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.