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Finding the Fourth Proportional to 1,447.89, 2,170.81 and 717

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Solution

The fourth proportional to 1,447.89, 2,170.81 and 717 is: 1,074.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,447.89 : 2,170.81 = 717 : x
  2. Step 2: Convert to fraction form
    1,447.89/2,170.81 = 717/x
  3. Step 3: Cross multiply
    1,447.89x = 2,170.81 × 717
  4. Step 4: Simplify right side
    1,447.89x = 1,556,470.77
  5. Step 5: Solve for x
    x = 1,556,470.77/1,447.89
  6. Step 6: Final answer
    x = 1,074.99

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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.