Home / 3,112.88-4,670.12-921.60

Finding the Fourth Proportional to 3,112.88, 4,670.12 and 921.60

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Solution

The fourth proportional to 3,112.88, 4,670.12 and 921.60 is: 1,382.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,112.88 : 4,670.12 = 921.60 : x
  2. Step 2: Convert to fraction form
    3,112.88/4,670.12 = 921.60/x
  3. Step 3: Cross multiply
    3,112.88x = 4,670.12 × 921.60
  4. Step 4: Simplify right side
    3,112.88x = 4,303,982.59
  5. Step 5: Solve for x
    x = 4,303,982.59/3,112.88
  6. Step 6: Final answer
    x = 1,382.64

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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.