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Finding the Fourth Proportional to 1,980, 2,730.78 and 1,192.68

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Solution

The fourth proportional to 1,980, 2,730.78 and 1,192.68 is: 1,644.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,980 : 2,730.78 = 1,192.68 : x
  2. Step 2: Convert to fraction form
    1,980/2,730.78 = 1,192.68/x
  3. Step 3: Cross multiply
    1,980x = 2,730.78 × 1,192.68
  4. Step 4: Simplify right side
    1,980x = 3,256,946.69
  5. Step 5: Solve for x
    x = 3,256,946.69/1,980
  6. Step 6: Final answer
    x = 1,644.92

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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.