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Finding the Fourth Proportional to 450.48, 620.38 and 405.84

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Solution

The fourth proportional to 450.48, 620.38 and 405.84 is: 558.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    450.48 : 620.38 = 405.84 : x
  2. Step 2: Convert to fraction form
    450.48/620.38 = 405.84/x
  3. Step 3: Cross multiply
    450.48x = 620.38 × 405.84
  4. Step 4: Simplify right side
    450.48x = 251,775.02
  5. Step 5: Solve for x
    x = 251,775.02/450.48
  6. Step 6: Final answer
    x = 558.90

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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.