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Finding the Fourth Proportional to 823.76, 1,234.81 and 385.15

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Solution

The fourth proportional to 823.76, 1,234.81 and 385.15 is: 577.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    823.76 : 1,234.81 = 385.15 : x
  2. Step 2: Convert to fraction form
    823.76/1,234.81 = 385.15/x
  3. Step 3: Cross multiply
    823.76x = 1,234.81 × 385.15
  4. Step 4: Simplify right side
    823.76x = 475,587.07
  5. Step 5: Solve for x
    x = 475,587.07/823.76
  6. Step 6: Final answer
    x = 577.34

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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.