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Finding the Fourth Proportional to 899.12, 1,238.90 and 689.33

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Solution

The fourth proportional to 899.12, 1,238.90 and 689.33 is: 949.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    899.12 : 1,238.90 = 689.33 : x
  2. Step 2: Convert to fraction form
    899.12/1,238.90 = 689.33/x
  3. Step 3: Cross multiply
    899.12x = 1,238.90 × 689.33
  4. Step 4: Simplify right side
    899.12x = 854,001.30
  5. Step 5: Solve for x
    x = 854,001.30/899.12
  6. Step 6: Final answer
    x = 949.82

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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.