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Finding the Fourth Proportional to 828.25, 1,143.03 and 479.05

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Solution

The fourth proportional to 828.25, 1,143.03 and 479.05 is: 661.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.25 : 1,143.03 = 479.05 : x
  2. Step 2: Convert to fraction form
    828.25/1,143.03 = 479.05/x
  3. Step 3: Cross multiply
    828.25x = 1,143.03 × 479.05
  4. Step 4: Simplify right side
    828.25x = 547,568.52
  5. Step 5: Solve for x
    x = 547,568.52/828.25
  6. Step 6: Final answer
    x = 661.12

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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.