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Finding the Fourth Proportional to 1,956.38, 2,699.80 and 1,128.38

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Solution

The fourth proportional to 1,956.38, 2,699.80 and 1,128.38 is: 1,557.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,956.38 : 2,699.80 = 1,128.38 : x
  2. Step 2: Convert to fraction form
    1,956.38/2,699.80 = 1,128.38/x
  3. Step 3: Cross multiply
    1,956.38x = 2,699.80 × 1,128.38
  4. Step 4: Simplify right side
    1,956.38x = 3,046,384.00
  5. Step 5: Solve for x
    x = 3,046,384.00/1,956.38
  6. Step 6: Final answer
    x = 1,557.16

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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.