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Finding the Fourth Proportional to 929.88, 1,392.86 and 620.73

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Solution

The fourth proportional to 929.88, 1,392.86 and 620.73 is: 929.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.88 : 1,392.86 = 620.73 : x
  2. Step 2: Convert to fraction form
    929.88/1,392.86 = 620.73/x
  3. Step 3: Cross multiply
    929.88x = 1,392.86 × 620.73
  4. Step 4: Simplify right side
    929.88x = 864,591.54
  5. Step 5: Solve for x
    x = 864,591.54/929.88
  6. Step 6: Final answer
    x = 929.79

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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.