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Finding the Fourth Proportional to 828.66, 1,143.60 and 479.40

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Solution

The fourth proportional to 828.66, 1,143.60 and 479.40 is: 661.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.66 : 1,143.60 = 479.40 : x
  2. Step 2: Convert to fraction form
    828.66/1,143.60 = 479.40/x
  3. Step 3: Cross multiply
    828.66x = 1,143.60 × 479.40
  4. Step 4: Simplify right side
    828.66x = 548,241.84
  5. Step 5: Solve for x
    x = 548,241.84/828.66
  6. Step 6: Final answer
    x = 661.60

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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.