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Finding the Fourth Proportional to 828.11, 1,142.76 and 455.09

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Solution

The fourth proportional to 828.11, 1,142.76 and 455.09 is: 628.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.11 : 1,142.76 = 455.09 : x
  2. Step 2: Convert to fraction form
    828.11/1,142.76 = 455.09/x
  3. Step 3: Cross multiply
    828.11x = 1,142.76 × 455.09
  4. Step 4: Simplify right side
    828.11x = 520,052.93
  5. Step 5: Solve for x
    x = 520,052.93/828.11
  6. Step 6: Final answer
    x = 628.00

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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.