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Finding the Fourth Proportional to 1,393.40, 2,090.10 and 664.40

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Solution

The fourth proportional to 1,393.40, 2,090.10 and 664.40 is: 996.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,393.40 : 2,090.10 = 664.40 : x
  2. Step 2: Convert to fraction form
    1,393.40/2,090.10 = 664.40/x
  3. Step 3: Cross multiply
    1,393.40x = 2,090.10 × 664.40
  4. Step 4: Simplify right side
    1,393.40x = 1,388,662.44
  5. Step 5: Solve for x
    x = 1,388,662.44/1,393.40
  6. Step 6: Final answer
    x = 996.60

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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.