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Finding the Fourth Proportional to 1,574.37, 2,172.74 and 911.45

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Solution

The fourth proportional to 1,574.37, 2,172.74 and 911.45 is: 1,257.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,574.37 : 2,172.74 = 911.45 : x
  2. Step 2: Convert to fraction form
    1,574.37/2,172.74 = 911.45/x
  3. Step 3: Cross multiply
    1,574.37x = 2,172.74 × 911.45
  4. Step 4: Simplify right side
    1,574.37x = 1,980,344.75
  5. Step 5: Solve for x
    x = 1,980,344.75/1,574.37
  6. Step 6: Final answer
    x = 1,257.86

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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.