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Finding the Fourth Proportional to 1,960.34, 2,940.53 and 661.91

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Solution

The fourth proportional to 1,960.34, 2,940.53 and 661.91 is: 992.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,960.34 : 2,940.53 = 661.91 : x
  2. Step 2: Convert to fraction form
    1,960.34/2,940.53 = 661.91/x
  3. Step 3: Cross multiply
    1,960.34x = 2,940.53 × 661.91
  4. Step 4: Simplify right side
    1,960.34x = 1,946,348.20
  5. Step 5: Solve for x
    x = 1,946,348.20/1,960.34
  6. Step 6: Final answer
    x = 992.87

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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.