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Finding the Fourth Proportional to 828.07, 1,142.78 and 478.87

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Solution

The fourth proportional to 828.07, 1,142.78 and 478.87 is: 660.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.07 : 1,142.78 = 478.87 : x
  2. Step 2: Convert to fraction form
    828.07/1,142.78 = 478.87/x
  3. Step 3: Cross multiply
    828.07x = 1,142.78 × 478.87
  4. Step 4: Simplify right side
    828.07x = 547,234.95
  5. Step 5: Solve for x
    x = 547,234.95/828.07
  6. Step 6: Final answer
    x = 660.86

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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.