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Finding the Fourth Proportional to 660.24, 990.48 and 552.78

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Solution

The fourth proportional to 660.24, 990.48 and 552.78 is: 829.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.24 : 990.48 = 552.78 : x
  2. Step 2: Convert to fraction form
    660.24/990.48 = 552.78/x
  3. Step 3: Cross multiply
    660.24x = 990.48 × 552.78
  4. Step 4: Simplify right side
    660.24x = 547,517.53
  5. Step 5: Solve for x
    x = 547,517.53/660.24
  6. Step 6: Final answer
    x = 829.27

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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.