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Finding the Fourth Proportional to 828.17, 1,142.87 and 455.14

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Solution

The fourth proportional to 828.17, 1,142.87 and 455.14 is: 628.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.17 : 1,142.87 = 455.14 : x
  2. Step 2: Convert to fraction form
    828.17/1,142.87 = 455.14/x
  3. Step 3: Cross multiply
    828.17x = 1,142.87 × 455.14
  4. Step 4: Simplify right side
    828.17x = 520,170.29
  5. Step 5: Solve for x
    x = 520,170.29/828.17
  6. Step 6: Final answer
    x = 628.09

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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.