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Finding the Fourth Proportional to 1,167.26, 1,610.86 and 643.30

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Solution

The fourth proportional to 1,167.26, 1,610.86 and 643.30 is: 887.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,167.26 : 1,610.86 = 643.30 : x
  2. Step 2: Convert to fraction form
    1,167.26/1,610.86 = 643.30/x
  3. Step 3: Cross multiply
    1,167.26x = 1,610.86 × 643.30
  4. Step 4: Simplify right side
    1,167.26x = 1,036,266.24
  5. Step 5: Solve for x
    x = 1,036,266.24/1,167.26
  6. Step 6: Final answer
    x = 887.78

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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.