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Finding the Fourth Proportional to 1,231.45, 1,699.36 and 671.92

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Solution

The fourth proportional to 1,231.45, 1,699.36 and 671.92 is: 927.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,231.45 : 1,699.36 = 671.92 : x
  2. Step 2: Convert to fraction form
    1,231.45/1,699.36 = 671.92/x
  3. Step 3: Cross multiply
    1,231.45x = 1,699.36 × 671.92
  4. Step 4: Simplify right side
    1,231.45x = 1,141,833.97
  5. Step 5: Solve for x
    x = 1,141,833.97/1,231.45
  6. Step 6: Final answer
    x = 927.23

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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.