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Finding the Fourth Proportional to 1,036.73, 1,431.47 and 638.94

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Solution

The fourth proportional to 1,036.73, 1,431.47 and 638.94 is: 882.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,036.73 : 1,431.47 = 638.94 : x
  2. Step 2: Convert to fraction form
    1,036.73/1,431.47 = 638.94/x
  3. Step 3: Cross multiply
    1,036.73x = 1,431.47 × 638.94
  4. Step 4: Simplify right side
    1,036.73x = 914,623.44
  5. Step 5: Solve for x
    x = 914,623.44/1,036.73
  6. Step 6: Final answer
    x = 882.22

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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.