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Finding the Fourth Proportional to 450.12, 621.12 and 261

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Solution

The fourth proportional to 450.12, 621.12 and 261 is: 360.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    450.12 : 621.12 = 261 : x
  2. Step 2: Convert to fraction form
    450.12/621.12 = 261/x
  3. Step 3: Cross multiply
    450.12x = 621.12 × 261
  4. Step 4: Simplify right side
    450.12x = 162,112.32
  5. Step 5: Solve for x
    x = 162,112.32/450.12
  6. Step 6: Final answer
    x = 360.15

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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.