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Finding the Fourth Proportional to 1,129, 1,557.44 and 756

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Solution

The fourth proportional to 1,129, 1,557.44 and 756 is: 1,042.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129 : 1,557.44 = 756 : x
  2. Step 2: Convert to fraction form
    1,129/1,557.44 = 756/x
  3. Step 3: Cross multiply
    1,129x = 1,557.44 × 756
  4. Step 4: Simplify right side
    1,129x = 1,177,424.64
  5. Step 5: Solve for x
    x = 1,177,424.64/1,129
  6. Step 6: Final answer
    x = 1,042.89

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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.