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Finding the Fourth Proportional to 450.48, 621.78 and 345.54

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Solution

The fourth proportional to 450.48, 621.78 and 345.54 is: 476.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    450.48 : 621.78 = 345.54 : x
  2. Step 2: Convert to fraction form
    450.48/621.78 = 345.54/x
  3. Step 3: Cross multiply
    450.48x = 621.78 × 345.54
  4. Step 4: Simplify right side
    450.48x = 214,849.86
  5. Step 5: Solve for x
    x = 214,849.86/450.48
  6. Step 6: Final answer
    x = 476.94

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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.