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Finding the Fourth Proportional to 1,574.62, 2,172.43 and 911.23

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Solution

The fourth proportional to 1,574.62, 2,172.43 and 911.23 is: 1,257.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,574.62 : 2,172.43 = 911.23 : x
  2. Step 2: Convert to fraction form
    1,574.62/2,172.43 = 911.23/x
  3. Step 3: Cross multiply
    1,574.62x = 2,172.43 × 911.23
  4. Step 4: Simplify right side
    1,574.62x = 1,979,583.39
  5. Step 5: Solve for x
    x = 1,979,583.39/1,574.62
  6. Step 6: Final answer
    x = 1,257.18

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.