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Finding the Fourth Proportional to 660.33, 990.63 and 455.00

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Solution

The fourth proportional to 660.33, 990.63 and 455.00 is: 682.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.33 : 990.63 = 455.00 : x
  2. Step 2: Convert to fraction form
    660.33/990.63 = 455.00/x
  3. Step 3: Cross multiply
    660.33x = 990.63 × 455.00
  4. Step 4: Simplify right side
    660.33x = 450,731.70
  5. Step 5: Solve for x
    x = 450,731.70/660.33
  6. Step 6: Final answer
    x = 682.59

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.