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Finding the Fourth Proportional to 828.69, 1,142.75 and 579.93

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Solution

The fourth proportional to 828.69, 1,142.75 and 579.93 is: 799.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.69 : 1,142.75 = 579.93 : x
  2. Step 2: Convert to fraction form
    828.69/1,142.75 = 579.93/x
  3. Step 3: Cross multiply
    828.69x = 1,142.75 × 579.93
  4. Step 4: Simplify right side
    828.69x = 662,712.11
  5. Step 5: Solve for x
    x = 662,712.11/828.69
  6. Step 6: Final answer
    x = 799.71

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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.