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Finding the Fourth Proportional to 1,186.39, 1,778.43 and 666.64

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Solution

The fourth proportional to 1,186.39, 1,778.43 and 666.64 is: 999.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,186.39 : 1,778.43 = 666.64 : x
  2. Step 2: Convert to fraction form
    1,186.39/1,778.43 = 666.64/x
  3. Step 3: Cross multiply
    1,186.39x = 1,778.43 × 666.64
  4. Step 4: Simplify right side
    1,186.39x = 1,185,572.58
  5. Step 5: Solve for x
    x = 1,185,572.58/1,186.39
  6. Step 6: Final answer
    x = 999.31

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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.