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Finding the Fourth Proportional to 1,343.90, 2,015.76 and 419.39

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Solution

The fourth proportional to 1,343.90, 2,015.76 and 419.39 is: 629.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,343.90 : 2,015.76 = 419.39 : x
  2. Step 2: Convert to fraction form
    1,343.90/2,015.76 = 419.39/x
  3. Step 3: Cross multiply
    1,343.90x = 2,015.76 × 419.39
  4. Step 4: Simplify right side
    1,343.90x = 845,389.59
  5. Step 5: Solve for x
    x = 845,389.59/1,343.90
  6. Step 6: Final answer
    x = 629.06

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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.