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Finding the Fourth Proportional to 1,942.38, 2,913.11 and 771.88

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Solution

The fourth proportional to 1,942.38, 2,913.11 and 771.88 is: 1,157.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,942.38 : 2,913.11 = 771.88 : x
  2. Step 2: Convert to fraction form
    1,942.38/2,913.11 = 771.88/x
  3. Step 3: Cross multiply
    1,942.38x = 2,913.11 × 771.88
  4. Step 4: Simplify right side
    1,942.38x = 2,248,552.92
  5. Step 5: Solve for x
    x = 2,248,552.92/1,942.38
  6. Step 6: Final answer
    x = 1,157.63

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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.