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Finding the Fourth Proportional to 2,808.58, 4,212.70 and 860.62

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Solution

The fourth proportional to 2,808.58, 4,212.70 and 860.62 is: 1,290.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,808.58 : 4,212.70 = 860.62 : x
  2. Step 2: Convert to fraction form
    2,808.58/4,212.70 = 860.62/x
  3. Step 3: Cross multiply
    2,808.58x = 4,212.70 × 860.62
  4. Step 4: Simplify right side
    2,808.58x = 3,625,533.87
  5. Step 5: Solve for x
    x = 3,625,533.87/2,808.58
  6. Step 6: Final answer
    x = 1,290.88

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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.