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Finding the Fourth Proportional to 2,939.28, 4,407.36 and 990.84

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Solution

The fourth proportional to 2,939.28, 4,407.36 and 990.84 is: 1,485.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,939.28 : 4,407.36 = 990.84 : x
  2. Step 2: Convert to fraction form
    2,939.28/4,407.36 = 990.84/x
  3. Step 3: Cross multiply
    2,939.28x = 4,407.36 × 990.84
  4. Step 4: Simplify right side
    2,939.28x = 4,366,988.58
  5. Step 5: Solve for x
    x = 4,366,988.58/2,939.28
  6. Step 6: Final answer
    x = 1,485.73

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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.