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Finding the Fourth Proportional to 828.42, 1,142.34 and 579.66

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Solution

The fourth proportional to 828.42, 1,142.34 and 579.66 is: 799.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.42 : 1,142.34 = 579.66 : x
  2. Step 2: Convert to fraction form
    828.42/1,142.34 = 579.66/x
  3. Step 3: Cross multiply
    828.42x = 1,142.34 × 579.66
  4. Step 4: Simplify right side
    828.42x = 662,168.80
  5. Step 5: Solve for x
    x = 662,168.80/828.42
  6. Step 6: Final answer
    x = 799.32

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1.5x scale

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.