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Finding the Fourth Proportional to 1,960.12, 2,940.60 and 661.57

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Solution

The fourth proportional to 1,960.12, 2,940.60 and 661.57 is: 992.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,960.12 : 2,940.60 = 661.57 : x
  2. Step 2: Convert to fraction form
    1,960.12/2,940.60 = 661.57/x
  3. Step 3: Cross multiply
    1,960.12x = 2,940.60 × 661.57
  4. Step 4: Simplify right side
    1,960.12x = 1,945,412.74
  5. Step 5: Solve for x
    x = 1,945,412.74/1,960.12
  6. Step 6: Final answer
    x = 992.50

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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.