Home / 6,921.86-10,382.81-1,990.35

Finding the Fourth Proportional to 6,921.86, 10,382.81 and 1,990.35

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Solution

The fourth proportional to 6,921.86, 10,382.81 and 1,990.35 is: 2,985.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,921.86 : 10,382.81 = 1,990.35 : x
  2. Step 2: Convert to fraction form
    6,921.86/10,382.81 = 1,990.35/x
  3. Step 3: Cross multiply
    6,921.86x = 10,382.81 × 1,990.35
  4. Step 4: Simplify right side
    6,921.86x = 20,665,415.93
  5. Step 5: Solve for x
    x = 20,665,415.93/6,921.86
  6. Step 6: Final answer
    x = 2,985.53

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Double scale
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Similar ratio
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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.