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Finding the Fourth Proportional to 828.40, 1,143.23 and 455.41

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Solution

The fourth proportional to 828.40, 1,143.23 and 455.41 is: 628.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.40 : 1,143.23 = 455.41 : x
  2. Step 2: Convert to fraction form
    828.40/1,143.23 = 455.41/x
  3. Step 3: Cross multiply
    828.40x = 1,143.23 × 455.41
  4. Step 4: Simplify right side
    828.40x = 520,638.37
  5. Step 5: Solve for x
    x = 520,638.37/828.40
  6. Step 6: Final answer
    x = 628.49

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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.