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Finding the Fourth Proportional to 828.16, 1,142.22 and 642.22

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Solution

The fourth proportional to 828.16, 1,142.22 and 642.22 is: 885.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.16 : 1,142.22 = 642.22 : x
  2. Step 2: Convert to fraction form
    828.16/1,142.22 = 642.22/x
  3. Step 3: Cross multiply
    828.16x = 1,142.22 × 642.22
  4. Step 4: Simplify right side
    828.16x = 733,556.53
  5. Step 5: Solve for x
    x = 733,556.53/828.16
  6. Step 6: Final answer
    x = 885.77

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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.