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Finding the Fourth Proportional to 828.15, 1,142.61 and 478.83

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Solution

The fourth proportional to 828.15, 1,142.61 and 478.83 is: 660.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.15 : 1,142.61 = 478.83 : x
  2. Step 2: Convert to fraction form
    828.15/1,142.61 = 478.83/x
  3. Step 3: Cross multiply
    828.15x = 1,142.61 × 478.83
  4. Step 4: Simplify right side
    828.15x = 547,115.95
  5. Step 5: Solve for x
    x = 547,115.95/828.15
  6. Step 6: Final answer
    x = 660.65

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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.