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Finding the Fourth Proportional to 1,167.34, 1,610.95 and 643.37

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Solution

The fourth proportional to 1,167.34, 1,610.95 and 643.37 is: 887.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,167.34 : 1,610.95 = 643.37 : x
  2. Step 2: Convert to fraction form
    1,167.34/1,610.95 = 643.37/x
  3. Step 3: Cross multiply
    1,167.34x = 1,610.95 × 643.37
  4. Step 4: Simplify right side
    1,167.34x = 1,036,436.90
  5. Step 5: Solve for x
    x = 1,036,436.90/1,167.34
  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.