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Finding the Fourth Proportional to 3,990.80, 5,984.40 and 1,798.40

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Solution

The fourth proportional to 3,990.80, 5,984.40 and 1,798.40 is: 2,696.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990.80 : 5,984.40 = 1,798.40 : x
  2. Step 2: Convert to fraction form
    3,990.80/5,984.40 = 1,798.40/x
  3. Step 3: Cross multiply
    3,990.80x = 5,984.40 × 1,798.40
  4. Step 4: Simplify right side
    3,990.80x = 10,762,344.96
  5. Step 5: Solve for x
    x = 10,762,344.96/3,990.80
  6. Step 6: Final answer
    x = 2,696.79

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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.