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Finding the Fourth Proportional to 1,418.13, 1,957.33 and 828.75

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Solution

The fourth proportional to 1,418.13, 1,957.33 and 828.75 is: 1,143.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,418.13 : 1,957.33 = 828.75 : x
  2. Step 2: Convert to fraction form
    1,418.13/1,957.33 = 828.75/x
  3. Step 3: Cross multiply
    1,418.13x = 1,957.33 × 828.75
  4. Step 4: Simplify right side
    1,418.13x = 1,622,145.61
  5. Step 5: Solve for x
    x = 1,622,145.61/1,418.13
  6. Step 6: Final answer
    x = 1,143.86

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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.