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Finding the Fourth Proportional to 660.69, 911.79 and 450.90

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Solution

The fourth proportional to 660.69, 911.79 and 450.90 is: 622.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.69 : 911.79 = 450.90 : x
  2. Step 2: Convert to fraction form
    660.69/911.79 = 450.90/x
  3. Step 3: Cross multiply
    660.69x = 911.79 × 450.90
  4. Step 4: Simplify right side
    660.69x = 411,126.11
  5. Step 5: Solve for x
    x = 411,126.11/660.69
  6. Step 6: Final answer
    x = 622.27

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1.5x scale

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.