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Finding the Fourth Proportional to 2,718.86, 4,077.95 and 771.21

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Solution

The fourth proportional to 2,718.86, 4,077.95 and 771.21 is: 1,156.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,718.86 : 4,077.95 = 771.21 : x
  2. Step 2: Convert to fraction form
    2,718.86/4,077.95 = 771.21/x
  3. Step 3: Cross multiply
    2,718.86x = 4,077.95 × 771.21
  4. Step 4: Simplify right side
    2,718.86x = 3,144,951.96
  5. Step 5: Solve for x
    x = 3,144,951.96/2,718.86
  6. Step 6: Final answer
    x = 1,156.72

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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.