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Finding the Fourth Proportional to 1,167.36, 1,610.94 and 643.38

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Solution

The fourth proportional to 1,167.36, 1,610.94 and 643.38 is: 887.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,167.36 : 1,610.94 = 643.38 : x
  2. Step 2: Convert to fraction form
    1,167.36/1,610.94 = 643.38/x
  3. Step 3: Cross multiply
    1,167.36x = 1,610.94 × 643.38
  4. Step 4: Simplify right side
    1,167.36x = 1,036,446.58
  5. Step 5: Solve for x
    x = 1,036,446.58/1,167.36
  6. Step 6: Final answer
    x = 887.86

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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.