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Finding the Fourth Proportional to 1,245.15, 1,720.14 and 966.09

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Solution

The fourth proportional to 1,245.15, 1,720.14 and 966.09 is: 1,334.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.15 : 1,720.14 = 966.09 : x
  2. Step 2: Convert to fraction form
    1,245.15/1,720.14 = 966.09/x
  3. Step 3: Cross multiply
    1,245.15x = 1,720.14 × 966.09
  4. Step 4: Simplify right side
    1,245.15x = 1,661,810.05
  5. Step 5: Solve for x
    x = 1,661,810.05/1,245.15
  6. Step 6: Final answer
    x = 1,334.63

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.