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Finding the Fourth Proportional to 1,189.45, 1,783.48 and 995.66

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Solution

The fourth proportional to 1,189.45, 1,783.48 and 995.66 is: 1,492.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,189.45 : 1,783.48 = 995.66 : x
  2. Step 2: Convert to fraction form
    1,189.45/1,783.48 = 995.66/x
  3. Step 3: Cross multiply
    1,189.45x = 1,783.48 × 995.66
  4. Step 4: Simplify right side
    1,189.45x = 1,775,739.70
  5. Step 5: Solve for x
    x = 1,775,739.70/1,189.45
  6. Step 6: Final answer
    x = 1,492.91

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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.