Home / 6,921.47-10,380.65-1,990.01

Finding the Fourth Proportional to 6,921.47, 10,380.65 and 1,990.01

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Solution

The fourth proportional to 6,921.47, 10,380.65 and 1,990.01 is: 2,984.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,921.47 : 10,380.65 = 1,990.01 : x
  2. Step 2: Convert to fraction form
    6,921.47/10,380.65 = 1,990.01/x
  3. Step 3: Cross multiply
    6,921.47x = 10,380.65 × 1,990.01
  4. Step 4: Simplify right side
    6,921.47x = 20,657,535.45
  5. Step 5: Solve for x
    x = 20,657,535.45/6,921.47
  6. Step 6: Final answer
    x = 2,984.56

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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.