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Finding the Fourth Proportional to 1,574.60, 2,172.75 and 911.48

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Solution

The fourth proportional to 1,574.60, 2,172.75 and 911.48 is: 1,257.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,574.60 : 2,172.75 = 911.48 : x
  2. Step 2: Convert to fraction form
    1,574.60/2,172.75 = 911.48/x
  3. Step 3: Cross multiply
    1,574.60x = 2,172.75 × 911.48
  4. Step 4: Simplify right side
    1,574.60x = 1,980,418.17
  5. Step 5: Solve for x
    x = 1,980,418.17/1,574.60
  6. Step 6: Final answer
    x = 1,257.73

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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.