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Finding the Fourth Proportional to 1,231.47, 1,699.43 and 671.94

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Solution

The fourth proportional to 1,231.47, 1,699.43 and 671.94 is: 927.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,231.47 : 1,699.43 = 671.94 : x
  2. Step 2: Convert to fraction form
    1,231.47/1,699.43 = 671.94/x
  3. Step 3: Cross multiply
    1,231.47x = 1,699.43 × 671.94
  4. Step 4: Simplify right side
    1,231.47x = 1,141,917.80
  5. Step 5: Solve for x
    x = 1,141,917.80/1,231.47
  6. Step 6: Final answer
    x = 927.28

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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.