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Finding the Fourth Proportional to 1,394, 2,090.58 and 419.80

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Solution

The fourth proportional to 1,394, 2,090.58 and 419.80 is: 629.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,394 : 2,090.58 = 419.80 : x
  2. Step 2: Convert to fraction form
    1,394/2,090.58 = 419.80/x
  3. Step 3: Cross multiply
    1,394x = 2,090.58 × 419.80
  4. Step 4: Simplify right side
    1,394x = 877,625.48
  5. Step 5: Solve for x
    x = 877,625.48/1,394
  6. Step 6: Final answer
    x = 629.57

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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.