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Finding the Fourth Proportional to 828.67, 1,143.58 and 455.64

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Solution

The fourth proportional to 828.67, 1,143.58 and 455.64 is: 628.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.67 : 1,143.58 = 455.64 : x
  2. Step 2: Convert to fraction form
    828.67/1,143.58 = 455.64/x
  3. Step 3: Cross multiply
    828.67x = 1,143.58 × 455.64
  4. Step 4: Simplify right side
    828.67x = 521,060.79
  5. Step 5: Solve for x
    x = 521,060.79/828.67
  6. Step 6: Final answer
    x = 628.79

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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.