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Finding the Fourth Proportional to 1,185.66, 1,777.28 and 665.90

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Solution

The fourth proportional to 1,185.66, 1,777.28 and 665.90 is: 998.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,185.66 : 1,777.28 = 665.90 : x
  2. Step 2: Convert to fraction form
    1,185.66/1,777.28 = 665.90/x
  3. Step 3: Cross multiply
    1,185.66x = 1,777.28 × 665.90
  4. Step 4: Simplify right side
    1,185.66x = 1,183,490.75
  5. Step 5: Solve for x
    x = 1,183,490.75/1,185.66
  6. Step 6: Final answer
    x = 998.17

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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.