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Finding the Fourth Proportional to 1,172.21, 1,758.92 and 762.14

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Solution

The fourth proportional to 1,172.21, 1,758.92 and 762.14 is: 1,143.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,172.21 : 1,758.92 = 762.14 : x
  2. Step 2: Convert to fraction form
    1,172.21/1,758.92 = 762.14/x
  3. Step 3: Cross multiply
    1,172.21x = 1,758.92 × 762.14
  4. Step 4: Simplify right side
    1,172.21x = 1,340,543.88
  5. Step 5: Solve for x
    x = 1,340,543.88/1,172.21
  6. Step 6: Final answer
    x = 1,143.61

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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.