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Finding the Fourth Proportional to 660.72, 991.08 and 198.51

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Solution

The fourth proportional to 660.72, 991.08 and 198.51 is: 297.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.72 : 991.08 = 198.51 : x
  2. Step 2: Convert to fraction form
    660.72/991.08 = 198.51/x
  3. Step 3: Cross multiply
    660.72x = 991.08 × 198.51
  4. Step 4: Simplify right side
    660.72x = 196,739.29
  5. Step 5: Solve for x
    x = 196,739.29/660.72
  6. Step 6: Final answer
    x = 297.77

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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.