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Finding the Fourth Proportional to 1,231.67, 1,699.68 and 672.13

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Solution

The fourth proportional to 1,231.67, 1,699.68 and 672.13 is: 927.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,231.67 : 1,699.68 = 672.13 : x
  2. Step 2: Convert to fraction form
    1,231.67/1,699.68 = 672.13/x
  3. Step 3: Cross multiply
    1,231.67x = 1,699.68 × 672.13
  4. Step 4: Simplify right side
    1,231.67x = 1,142,409.67
  5. Step 5: Solve for x
    x = 1,142,409.67/1,231.67
  6. Step 6: Final answer
    x = 927.53

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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.