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Finding the Fourth Proportional to 823.78, 1,234.86 and 458.38

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Solution

The fourth proportional to 823.78, 1,234.86 and 458.38 is: 687.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    823.78 : 1,234.86 = 458.38 : x
  2. Step 2: Convert to fraction form
    823.78/1,234.86 = 458.38/x
  3. Step 3: Cross multiply
    823.78x = 1,234.86 × 458.38
  4. Step 4: Simplify right side
    823.78x = 566,035.13
  5. Step 5: Solve for x
    x = 566,035.13/823.78
  6. Step 6: Final answer
    x = 687.12

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.