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Finding the Fourth Proportional to 921.93, 1,382.93 and 305.70

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Solution

The fourth proportional to 921.93, 1,382.93 and 305.70 is: 458.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.93 : 1,382.93 = 305.70 : x
  2. Step 2: Convert to fraction form
    921.93/1,382.93 = 305.70/x
  3. Step 3: Cross multiply
    921.93x = 1,382.93 × 305.70
  4. Step 4: Simplify right side
    921.93x = 422,761.70
  5. Step 5: Solve for x
    x = 422,761.70/921.93
  6. Step 6: Final answer
    x = 458.56

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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.