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Finding the Fourth Proportional to 2,808.09, 4,211.98 and 860.30

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Solution

The fourth proportional to 2,808.09, 4,211.98 and 860.30 is: 1,290.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,808.09 : 4,211.98 = 860.30 : x
  2. Step 2: Convert to fraction form
    2,808.09/4,211.98 = 860.30/x
  3. Step 3: Cross multiply
    2,808.09x = 4,211.98 × 860.30
  4. Step 4: Simplify right side
    2,808.09x = 3,623,543.18
  5. Step 5: Solve for x
    x = 3,623,543.18/2,808.09
  6. Step 6: Final answer
    x = 1,290.39

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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.