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Finding the Fourth Proportional to 1,239.23, 1,710.11 and 679.73

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Solution

The fourth proportional to 1,239.23, 1,710.11 and 679.73 is: 938.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.23 : 1,710.11 = 679.73 : x
  2. Step 2: Convert to fraction form
    1,239.23/1,710.11 = 679.73/x
  3. Step 3: Cross multiply
    1,239.23x = 1,710.11 × 679.73
  4. Step 4: Simplify right side
    1,239.23x = 1,162,406.22
  5. Step 5: Solve for x
    x = 1,162,406.22/1,239.23
  6. Step 6: Final answer
    x = 938.00

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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.