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Finding the Fourth Proportional to 450.48, 621.39 and 319.26

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Solution

The fourth proportional to 450.48, 621.39 and 319.26 is: 440.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    450.48 : 621.39 = 319.26 : x
  2. Step 2: Convert to fraction form
    450.48/621.39 = 319.26/x
  3. Step 3: Cross multiply
    450.48x = 621.39 × 319.26
  4. Step 4: Simplify right side
    450.48x = 198,384.97
  5. Step 5: Solve for x
    x = 198,384.97/450.48
  6. Step 6: Final answer
    x = 440.39

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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.