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Finding the Fourth Proportional to 928.27, 1,393.07 and 685.45

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Solution

The fourth proportional to 928.27, 1,393.07 and 685.45 is: 1,028.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.27 : 1,393.07 = 685.45 : x
  2. Step 2: Convert to fraction form
    928.27/1,393.07 = 685.45/x
  3. Step 3: Cross multiply
    928.27x = 1,393.07 × 685.45
  4. Step 4: Simplify right side
    928.27x = 954,879.83
  5. Step 5: Solve for x
    x = 954,879.83/928.27
  6. Step 6: Final answer
    x = 1,028.67

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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.