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Finding the Fourth Proportional to 1,286.79, 1,775.69 and 719.62

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Solution

The fourth proportional to 1,286.79, 1,775.69 and 719.62 is: 993.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,286.79 : 1,775.69 = 719.62 : x
  2. Step 2: Convert to fraction form
    1,286.79/1,775.69 = 719.62/x
  3. Step 3: Cross multiply
    1,286.79x = 1,775.69 × 719.62
  4. Step 4: Simplify right side
    1,286.79x = 1,277,816.70
  5. Step 5: Solve for x
    x = 1,277,816.70/1,286.79
  6. Step 6: Final answer
    x = 993.03

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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.