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Finding the Fourth Proportional to 3,112.80, 4,669.21 and 921.54

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Solution

The fourth proportional to 3,112.80, 4,669.21 and 921.54 is: 1,382.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,112.80 : 4,669.21 = 921.54 : x
  2. Step 2: Convert to fraction form
    3,112.80/4,669.21 = 921.54/x
  3. Step 3: Cross multiply
    3,112.80x = 4,669.21 × 921.54
  4. Step 4: Simplify right side
    3,112.80x = 4,302,882.44
  5. Step 5: Solve for x
    x = 4,302,882.44/3,112.80
  6. Step 6: Final answer
    x = 1,382.32

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1.5x scale

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.