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Finding the Fourth Proportional to 2,415.81, 3,623.94 and 771.96

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Solution

The fourth proportional to 2,415.81, 3,623.94 and 771.96 is: 1,158.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,415.81 : 3,623.94 = 771.96 : x
  2. Step 2: Convert to fraction form
    2,415.81/3,623.94 = 771.96/x
  3. Step 3: Cross multiply
    2,415.81x = 3,623.94 × 771.96
  4. Step 4: Simplify right side
    2,415.81x = 2,797,550.31
  5. Step 5: Solve for x
    x = 2,797,550.31/2,415.81
  6. Step 6: Final answer
    x = 1,158.02

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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.