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Finding the Fourth Proportional to 1,812.05, 2,719.10 and 771.94

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Solution

The fourth proportional to 1,812.05, 2,719.10 and 771.94 is: 1,158.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,812.05 : 2,719.10 = 771.94 : x
  2. Step 2: Convert to fraction form
    1,812.05/2,719.10 = 771.94/x
  3. Step 3: Cross multiply
    1,812.05x = 2,719.10 × 771.94
  4. Step 4: Simplify right side
    1,812.05x = 2,098,974.67
  5. Step 5: Solve for x
    x = 2,098,974.67/1,812.05
  6. Step 6: Final answer
    x = 1,158.35

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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.