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Finding the Fourth Proportional to 828.59, 1,143.38 and 479.21

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Solution

The fourth proportional to 828.59, 1,143.38 and 479.21 is: 661.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.59 : 1,143.38 = 479.21 : x
  2. Step 2: Convert to fraction form
    828.59/1,143.38 = 479.21/x
  3. Step 3: Cross multiply
    828.59x = 1,143.38 × 479.21
  4. Step 4: Simplify right side
    828.59x = 547,911.02
  5. Step 5: Solve for x
    x = 547,911.02/828.59
  6. Step 6: Final answer
    x = 661.26

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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.