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Finding the Fourth Proportional to 1,766.81, 2,438.49 and 981.11

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Solution

The fourth proportional to 1,766.81, 2,438.49 and 981.11 is: 1,354.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,766.81 : 2,438.49 = 981.11 : x
  2. Step 2: Convert to fraction form
    1,766.81/2,438.49 = 981.11/x
  3. Step 3: Cross multiply
    1,766.81x = 2,438.49 × 981.11
  4. Step 4: Simplify right side
    1,766.81x = 2,392,414.73
  5. Step 5: Solve for x
    x = 2,392,414.73/1,766.81
  6. Step 6: Final answer
    x = 1,354.09

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.