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Finding the Fourth Proportional to 2,809.60, 4,214.23 and 861.80

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Solution

The fourth proportional to 2,809.60, 4,214.23 and 861.80 is: 1,292.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,809.60 : 4,214.23 = 861.80 : x
  2. Step 2: Convert to fraction form
    2,809.60/4,214.23 = 861.80/x
  3. Step 3: Cross multiply
    2,809.60x = 4,214.23 × 861.80
  4. Step 4: Simplify right side
    2,809.60x = 3,631,800.19
  5. Step 5: Solve for x
    x = 3,631,800.19/2,809.60
  6. Step 6: Final answer
    x = 1,292.64

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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.