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Finding the Fourth Proportional to 928.74, 1,394.48 and 518.68

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Solution

The fourth proportional to 928.74, 1,394.48 and 518.68 is: 778.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.74 : 1,394.48 = 518.68 : x
  2. Step 2: Convert to fraction form
    928.74/1,394.48 = 518.68/x
  3. Step 3: Cross multiply
    928.74x = 1,394.48 × 518.68
  4. Step 4: Simplify right side
    928.74x = 723,288.89
  5. Step 5: Solve for x
    x = 723,288.89/928.74
  6. Step 6: Final answer
    x = 778.79

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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.