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Finding the Fourth Proportional to 450.40, 620.40 and 346.72

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Solution

The fourth proportional to 450.40, 620.40 and 346.72 is: 477.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    450.40 : 620.40 = 346.72 : x
  2. Step 2: Convert to fraction form
    450.40/620.40 = 346.72/x
  3. Step 3: Cross multiply
    450.40x = 620.40 × 346.72
  4. Step 4: Simplify right side
    450.40x = 215,105.09
  5. Step 5: Solve for x
    x = 215,105.09/450.40
  6. Step 6: Final answer
    x = 477.59

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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.