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Finding the Fourth Proportional to 2,115.46, 3,172.02 and 654.22

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Solution

The fourth proportional to 2,115.46, 3,172.02 and 654.22 is: 980.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,115.46 : 3,172.02 = 654.22 : x
  2. Step 2: Convert to fraction form
    2,115.46/3,172.02 = 654.22/x
  3. Step 3: Cross multiply
    2,115.46x = 3,172.02 × 654.22
  4. Step 4: Simplify right side
    2,115.46x = 2,075,198.92
  5. Step 5: Solve for x
    x = 2,075,198.92/2,115.46
  6. Step 6: Final answer
    x = 980.97

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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.