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Finding the Fourth Proportional to 1,143.21, 1,714.37 and 412.39

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Solution

The fourth proportional to 1,143.21, 1,714.37 and 412.39 is: 618.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,143.21 : 1,714.37 = 412.39 : x
  2. Step 2: Convert to fraction form
    1,143.21/1,714.37 = 412.39/x
  3. Step 3: Cross multiply
    1,143.21x = 1,714.37 × 412.39
  4. Step 4: Simplify right side
    1,143.21x = 706,989.13
  5. Step 5: Solve for x
    x = 706,989.13/1,143.21
  6. Step 6: Final answer
    x = 618.42

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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.