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Finding the Fourth Proportional to 449.55, 620.31 and 283.86

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Solution

The fourth proportional to 449.55, 620.31 and 283.86 is: 391.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.55 : 620.31 = 283.86 : x
  2. Step 2: Convert to fraction form
    449.55/620.31 = 283.86/x
  3. Step 3: Cross multiply
    449.55x = 620.31 × 283.86
  4. Step 4: Simplify right side
    449.55x = 176,078.10
  5. Step 5: Solve for x
    x = 176,078.10/449.55
  6. Step 6: Final answer
    x = 391.68

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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.