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Finding the Fourth Proportional to 1,279.37, 1,917.77 and 817.67

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Solution

The fourth proportional to 1,279.37, 1,917.77 and 817.67 is: 1,225.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.37 : 1,917.77 = 817.67 : x
  2. Step 2: Convert to fraction form
    1,279.37/1,917.77 = 817.67/x
  3. Step 3: Cross multiply
    1,279.37x = 1,917.77 × 817.67
  4. Step 4: Simplify right side
    1,279.37x = 1,568,089.32
  5. Step 5: Solve for x
    x = 1,568,089.32/1,279.37
  6. Step 6: Final answer
    x = 1,225.68

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1.5x scale

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.