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Finding the Fourth Proportional to 450.64, 621.78 and 285.07

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Solution

The fourth proportional to 450.64, 621.78 and 285.07 is: 393.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    450.64 : 621.78 = 285.07 : x
  2. Step 2: Convert to fraction form
    450.64/621.78 = 285.07/x
  3. Step 3: Cross multiply
    450.64x = 621.78 × 285.07
  4. Step 4: Simplify right side
    450.64x = 177,250.82
  5. Step 5: Solve for x
    x = 177,250.82/450.64
  6. Step 6: Final answer
    x = 393.33

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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.