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Finding the Fourth Proportional to 2,625.81, 3,938.71 and 677.86

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Solution

The fourth proportional to 2,625.81, 3,938.71 and 677.86 is: 1,016.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,625.81 : 3,938.71 = 677.86 : x
  2. Step 2: Convert to fraction form
    2,625.81/3,938.71 = 677.86/x
  3. Step 3: Cross multiply
    2,625.81x = 3,938.71 × 677.86
  4. Step 4: Simplify right side
    2,625.81x = 2,669,895.66
  5. Step 5: Solve for x
    x = 2,669,895.66/2,625.81
  6. Step 6: Final answer
    x = 1,016.79

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1.5x scale

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.