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Finding the Fourth Proportional to 1,143.10, 1,714.72 and 321.44

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Solution

The fourth proportional to 1,143.10, 1,714.72 and 321.44 is: 482.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,143.10 : 1,714.72 = 321.44 : x
  2. Step 2: Convert to fraction form
    1,143.10/1,714.72 = 321.44/x
  3. Step 3: Cross multiply
    1,143.10x = 1,714.72 × 321.44
  4. Step 4: Simplify right side
    1,143.10x = 551,179.60
  5. Step 5: Solve for x
    x = 551,179.60/1,143.10
  6. Step 6: Final answer
    x = 482.18

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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.