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Finding the Fourth Proportional to 450.50, 621.40 and 319.28

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Solution

The fourth proportional to 450.50, 621.40 and 319.28 is: 440.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    450.50 : 621.40 = 319.28 : x
  2. Step 2: Convert to fraction form
    450.50/621.40 = 319.28/x
  3. Step 3: Cross multiply
    450.50x = 621.40 × 319.28
  4. Step 4: Simplify right side
    450.50x = 198,400.59
  5. Step 5: Solve for x
    x = 198,400.59/450.50
  6. Step 6: Final answer
    x = 440.40

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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.