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Finding the Fourth Proportional to 1,978.74, 2,730.36 and 1,128

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Solution

The fourth proportional to 1,978.74, 2,730.36 and 1,128 is: 1,556.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,978.74 : 2,730.36 = 1,128 : x
  2. Step 2: Convert to fraction form
    1,978.74/2,730.36 = 1,128/x
  3. Step 3: Cross multiply
    1,978.74x = 2,730.36 × 1,128
  4. Step 4: Simplify right side
    1,978.74x = 3,079,846.08
  5. Step 5: Solve for x
    x = 3,079,846.08/1,978.74
  6. Step 6: Final answer
    x = 1,556.47

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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.