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Finding the Fourth Proportional to 2,809.68, 4,215.08 and 861.72

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Solution

The fourth proportional to 2,809.68, 4,215.08 and 861.72 is: 1,292.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,809.68 : 4,215.08 = 861.72 : x
  2. Step 2: Convert to fraction form
    2,809.68/4,215.08 = 861.72/x
  3. Step 3: Cross multiply
    2,809.68x = 4,215.08 × 861.72
  4. Step 4: Simplify right side
    2,809.68x = 3,632,218.74
  5. Step 5: Solve for x
    x = 3,632,218.74/2,809.68
  6. Step 6: Final answer
    x = 1,292.75

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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.