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Finding the Fourth Proportional to 1,393.78, 2,090.30 and 419.92

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Solution

The fourth proportional to 1,393.78, 2,090.30 and 419.92 is: 629.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,393.78 : 2,090.30 = 419.92 : x
  2. Step 2: Convert to fraction form
    1,393.78/2,090.30 = 419.92/x
  3. Step 3: Cross multiply
    1,393.78x = 2,090.30 × 419.92
  4. Step 4: Simplify right side
    1,393.78x = 877,758.78
  5. Step 5: Solve for x
    x = 877,758.78/1,393.78
  6. Step 6: Final answer
    x = 629.77

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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.