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Finding the Fourth Proportional to 818.86, 1,228.80 and 331.91

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Solution

The fourth proportional to 818.86, 1,228.80 and 331.91 is: 498.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.86 : 1,228.80 = 331.91 : x
  2. Step 2: Convert to fraction form
    818.86/1,228.80 = 331.91/x
  3. Step 3: Cross multiply
    818.86x = 1,228.80 × 331.91
  4. Step 4: Simplify right side
    818.86x = 407,851.01
  5. Step 5: Solve for x
    x = 407,851.01/818.86
  6. Step 6: Final answer
    x = 498.07

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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.