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Finding the Fourth Proportional to 450.39, 621.56 and 253.89

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Solution

The fourth proportional to 450.39, 621.56 and 253.89 is: 350.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    450.39 : 621.56 = 253.89 : x
  2. Step 2: Convert to fraction form
    450.39/621.56 = 253.89/x
  3. Step 3: Cross multiply
    450.39x = 621.56 × 253.89
  4. Step 4: Simplify right side
    450.39x = 157,806.60
  5. Step 5: Solve for x
    x = 157,806.60/450.39
  6. Step 6: Final answer
    x = 350.38

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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.