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Finding the Fourth Proportional to 2,097.96, 3,147.12 and 781.32

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Solution

The fourth proportional to 2,097.96, 3,147.12 and 781.32 is: 1,172.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,097.96 : 3,147.12 = 781.32 : x
  2. Step 2: Convert to fraction form
    2,097.96/3,147.12 = 781.32/x
  3. Step 3: Cross multiply
    2,097.96x = 3,147.12 × 781.32
  4. Step 4: Simplify right side
    2,097.96x = 2,458,907.80
  5. Step 5: Solve for x
    x = 2,458,907.80/2,097.96
  6. Step 6: Final answer
    x = 1,172.05

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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.