Home / 2,720.15-4,078.96-870.85

Finding the Fourth Proportional to 2,720.15, 4,078.96 and 870.85

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Solution

The fourth proportional to 2,720.15, 4,078.96 and 870.85 is: 1,305.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,720.15 : 4,078.96 = 870.85 : x
  2. Step 2: Convert to fraction form
    2,720.15/4,078.96 = 870.85/x
  3. Step 3: Cross multiply
    2,720.15x = 4,078.96 × 870.85
  4. Step 4: Simplify right side
    2,720.15x = 3,552,157.96
  5. Step 5: Solve for x
    x = 3,552,157.96/2,720.15
  6. Step 6: Final answer
    x = 1,305.87

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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.