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Finding the Fourth Proportional to 828.37, 1,143.15 and 455.33

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Solution

The fourth proportional to 828.37, 1,143.15 and 455.33 is: 628.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.37 : 1,143.15 = 455.33 : x
  2. Step 2: Convert to fraction form
    828.37/1,143.15 = 455.33/x
  3. Step 3: Cross multiply
    828.37x = 1,143.15 × 455.33
  4. Step 4: Simplify right side
    828.37x = 520,513.35
  5. Step 5: Solve for x
    x = 520,513.35/828.37
  6. Step 6: Final answer
    x = 628.36

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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.