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Finding the Fourth Proportional to 928.78, 1,281.36 and 579.70

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Solution

The fourth proportional to 928.78, 1,281.36 and 579.70 is: 799.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.78 : 1,281.36 = 579.70 : x
  2. Step 2: Convert to fraction form
    928.78/1,281.36 = 579.70/x
  3. Step 3: Cross multiply
    928.78x = 1,281.36 × 579.70
  4. Step 4: Simplify right side
    928.78x = 742,804.39
  5. Step 5: Solve for x
    x = 742,804.39/928.78
  6. Step 6: Final answer
    x = 799.76

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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.