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Finding the Fourth Proportional to 1,956, 2,699.28 and 1,128.48

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Solution

The fourth proportional to 1,956, 2,699.28 and 1,128.48 is: 1,557.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,956 : 2,699.28 = 1,128.48 : x
  2. Step 2: Convert to fraction form
    1,956/2,699.28 = 1,128.48/x
  3. Step 3: Cross multiply
    1,956x = 2,699.28 × 1,128.48
  4. Step 4: Simplify right side
    1,956x = 3,046,083.49
  5. Step 5: Solve for x
    x = 3,046,083.49/1,956
  6. Step 6: Final answer
    x = 1,557.30

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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.