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Finding the Fourth Proportional to 1,286.18, 1,774.03 and 789.06

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Solution

The fourth proportional to 1,286.18, 1,774.03 and 789.06 is: 1,088.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,286.18 : 1,774.03 = 789.06 : x
  2. Step 2: Convert to fraction form
    1,286.18/1,774.03 = 789.06/x
  3. Step 3: Cross multiply
    1,286.18x = 1,774.03 × 789.06
  4. Step 4: Simplify right side
    1,286.18x = 1,399,812.17
  5. Step 5: Solve for x
    x = 1,399,812.17/1,286.18
  6. Step 6: Final answer
    x = 1,088.35

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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.