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Finding the Fourth Proportional to 2,791.60, 4,187.40 and 739.60

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Solution

The fourth proportional to 2,791.60, 4,187.40 and 739.60 is: 1,109.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,791.60 : 4,187.40 = 739.60 : x
  2. Step 2: Convert to fraction form
    2,791.60/4,187.40 = 739.60/x
  3. Step 3: Cross multiply
    2,791.60x = 4,187.40 × 739.60
  4. Step 4: Simplify right side
    2,791.60x = 3,097,001.04
  5. Step 5: Solve for x
    x = 3,097,001.04/2,791.60
  6. Step 6: Final answer
    x = 1,109.40

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1.5x scale

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.