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Finding the Fourth Proportional to 1,393.81, 2,090.75 and 419.91

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Solution

The fourth proportional to 1,393.81, 2,090.75 and 419.91 is: 629.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,393.81 : 2,090.75 = 419.91 : x
  2. Step 2: Convert to fraction form
    1,393.81/2,090.75 = 419.91/x
  3. Step 3: Cross multiply
    1,393.81x = 2,090.75 × 419.91
  4. Step 4: Simplify right side
    1,393.81x = 877,924.73
  5. Step 5: Solve for x
    x = 877,924.73/1,393.81
  6. Step 6: Final answer
    x = 629.88

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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.