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Finding the Fourth Proportional to 824.78, 1,230.39 and 765.86

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Solution

The fourth proportional to 824.78, 1,230.39 and 765.86 is: 1,142.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    824.78 : 1,230.39 = 765.86 : x
  2. Step 2: Convert to fraction form
    824.78/1,230.39 = 765.86/x
  3. Step 3: Cross multiply
    824.78x = 1,230.39 × 765.86
  4. Step 4: Simplify right side
    824.78x = 942,300.33
  5. Step 5: Solve for x
    x = 942,300.33/824.78
  6. Step 6: Final answer
    x = 1,142.48

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.