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Finding the Fourth Proportional to 1,942.87, 2,912.67 and 772.13

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Solution

The fourth proportional to 1,942.87, 2,912.67 and 772.13 is: 1,157.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,942.87 : 2,912.67 = 772.13 : x
  2. Step 2: Convert to fraction form
    1,942.87/2,912.67 = 772.13/x
  3. Step 3: Cross multiply
    1,942.87x = 2,912.67 × 772.13
  4. Step 4: Simplify right side
    1,942.87x = 2,248,959.89
  5. Step 5: Solve for x
    x = 2,248,959.89/1,942.87
  6. Step 6: Final answer
    x = 1,157.55

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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.