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Finding the Fourth Proportional to 450.28, 621.38 and 253.79

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Solution

The fourth proportional to 450.28, 621.38 and 253.79 is: 350.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    450.28 : 621.38 = 253.79 : x
  2. Step 2: Convert to fraction form
    450.28/621.38 = 253.79/x
  3. Step 3: Cross multiply
    450.28x = 621.38 × 253.79
  4. Step 4: Simplify right side
    450.28x = 157,700.03
  5. Step 5: Solve for x
    x = 157,700.03/450.28
  6. Step 6: Final answer
    x = 350.23

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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.