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Finding the Fourth Proportional to 928.28, 1,279.27 and 679.68

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Solution

The fourth proportional to 928.28, 1,279.27 and 679.68 is: 936.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.28 : 1,279.27 = 679.68 : x
  2. Step 2: Convert to fraction form
    928.28/1,279.27 = 679.68/x
  3. Step 3: Cross multiply
    928.28x = 1,279.27 × 679.68
  4. Step 4: Simplify right side
    928.28x = 869,494.23
  5. Step 5: Solve for x
    x = 869,494.23/928.28
  6. Step 6: Final answer
    x = 936.67

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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.