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Finding the Fourth Proportional to 2,718.85, 4,078.07 and 870.16

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Solution

The fourth proportional to 2,718.85, 4,078.07 and 870.16 is: 1,305.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,718.85 : 4,078.07 = 870.16 : x
  2. Step 2: Convert to fraction form
    2,718.85/4,078.07 = 870.16/x
  3. Step 3: Cross multiply
    2,718.85x = 4,078.07 × 870.16
  4. Step 4: Simplify right side
    2,718.85x = 3,548,573.39
  5. Step 5: Solve for x
    x = 3,548,573.39/2,718.85
  6. Step 6: Final answer
    x = 1,305.17

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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.