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Finding the Fourth Proportional to 828.75, 1,143.70 and 455.76

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Solution

The fourth proportional to 828.75, 1,143.70 and 455.76 is: 628.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.75 : 1,143.70 = 455.76 : x
  2. Step 2: Convert to fraction form
    828.75/1,143.70 = 455.76/x
  3. Step 3: Cross multiply
    828.75x = 1,143.70 × 455.76
  4. Step 4: Simplify right side
    828.75x = 521,251.56
  5. Step 5: Solve for x
    x = 521,251.56/828.75
  6. Step 6: Final answer
    x = 628.96

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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.