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Finding the Fourth Proportional to 1,393.64, 2,090.96 and 469.64

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Solution

The fourth proportional to 1,393.64, 2,090.96 and 469.64 is: 704.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,393.64 : 2,090.96 = 469.64 : x
  2. Step 2: Convert to fraction form
    1,393.64/2,090.96 = 469.64/x
  3. Step 3: Cross multiply
    1,393.64x = 2,090.96 × 469.64
  4. Step 4: Simplify right side
    1,393.64x = 981,998.45
  5. Step 5: Solve for x
    x = 981,998.45/1,393.64
  6. Step 6: Final answer
    x = 704.63

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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.