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Finding the Fourth Proportional to 660.53, 990.80 and 454.48

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Solution

The fourth proportional to 660.53, 990.80 and 454.48 is: 681.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.53 : 990.80 = 454.48 : x
  2. Step 2: Convert to fraction form
    660.53/990.80 = 454.48/x
  3. Step 3: Cross multiply
    660.53x = 990.80 × 454.48
  4. Step 4: Simplify right side
    660.53x = 450,294.03
  5. Step 5: Solve for x
    x = 450,294.03/660.53
  6. Step 6: Final answer
    x = 681.72

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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.