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Finding the Fourth Proportional to 1,231.97, 1,699.67 and 948.47

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Solution

The fourth proportional to 1,231.97, 1,699.67 and 948.47 is: 1,308.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,231.97 : 1,699.67 = 948.47 : x
  2. Step 2: Convert to fraction form
    1,231.97/1,699.67 = 948.47/x
  3. Step 3: Cross multiply
    1,231.97x = 1,699.67 × 948.47
  4. Step 4: Simplify right side
    1,231.97x = 1,612,079.14
  5. Step 5: Solve for x
    x = 1,612,079.14/1,231.97
  6. Step 6: Final answer
    x = 1,308.54

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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.