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Finding the Fourth Proportional to 450.68, 621.30 and 319.64

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Solution

The fourth proportional to 450.68, 621.30 and 319.64 is: 440.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    450.68 : 621.30 = 319.64 : x
  2. Step 2: Convert to fraction form
    450.68/621.30 = 319.64/x
  3. Step 3: Cross multiply
    450.68x = 621.30 × 319.64
  4. Step 4: Simplify right side
    450.68x = 198,592.33
  5. Step 5: Solve for x
    x = 198,592.33/450.68
  6. Step 6: Final answer
    x = 440.65

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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.