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Finding the Fourth Proportional to 1,185.60, 1,778.40 and 665.36

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Solution

The fourth proportional to 1,185.60, 1,778.40 and 665.36 is: 998.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,185.60 : 1,778.40 = 665.36 : x
  2. Step 2: Convert to fraction form
    1,185.60/1,778.40 = 665.36/x
  3. Step 3: Cross multiply
    1,185.60x = 1,778.40 × 665.36
  4. Step 4: Simplify right side
    1,185.60x = 1,183,276.22
  5. Step 5: Solve for x
    x = 1,183,276.22/1,185.60
  6. Step 6: Final answer
    x = 998.04

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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.