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Finding the Fourth Proportional to 1,541.52, 2,127.20 and 842.88

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Solution

The fourth proportional to 1,541.52, 2,127.20 and 842.88 is: 1,163.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,541.52 : 2,127.20 = 842.88 : x
  2. Step 2: Convert to fraction form
    1,541.52/2,127.20 = 842.88/x
  3. Step 3: Cross multiply
    1,541.52x = 2,127.20 × 842.88
  4. Step 4: Simplify right side
    1,541.52x = 1,792,974.34
  5. Step 5: Solve for x
    x = 1,792,974.34/1,541.52
  6. Step 6: Final answer
    x = 1,163.12

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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.