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Finding the Fourth Proportional to 1,279.56, 1,766.07 and 755.67

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Solution

The fourth proportional to 1,279.56, 1,766.07 and 755.67 is: 1,042.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.56 : 1,766.07 = 755.67 : x
  2. Step 2: Convert to fraction form
    1,279.56/1,766.07 = 755.67/x
  3. Step 3: Cross multiply
    1,279.56x = 1,766.07 × 755.67
  4. Step 4: Simplify right side
    1,279.56x = 1,334,566.12
  5. Step 5: Solve for x
    x = 1,334,566.12/1,279.56
  6. Step 6: Final answer
    x = 1,042.99

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1.5x scale

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.