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Finding the Fourth Proportional to 1,541.21, 2,126.84 and 842.57

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Solution

The fourth proportional to 1,541.21, 2,126.84 and 842.57 is: 1,162.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,541.21 : 2,126.84 = 842.57 : x
  2. Step 2: Convert to fraction form
    1,541.21/2,126.84 = 842.57/x
  3. Step 3: Cross multiply
    1,541.21x = 2,126.84 × 842.57
  4. Step 4: Simplify right side
    1,541.21x = 1,792,007.37
  5. Step 5: Solve for x
    x = 1,792,007.37/1,541.21
  6. Step 6: Final answer
    x = 1,162.73

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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.