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Finding the Fourth Proportional to 928.45, 1,391.59 and 682.70

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Solution

The fourth proportional to 928.45, 1,391.59 and 682.70 is: 1,023.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.45 : 1,391.59 = 682.70 : x
  2. Step 2: Convert to fraction form
    928.45/1,391.59 = 682.70/x
  3. Step 3: Cross multiply
    928.45x = 1,391.59 × 682.70
  4. Step 4: Simplify right side
    928.45x = 950,036.28
  5. Step 5: Solve for x
    x = 950,036.28/928.45
  6. Step 6: Final answer
    x = 1,023.25

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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.