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Finding the Fourth Proportional to 1,239.46, 1,710.45 and 679.92

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Solution

The fourth proportional to 1,239.46, 1,710.45 and 679.92 is: 938.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.46 : 1,710.45 = 679.92 : x
  2. Step 2: Convert to fraction form
    1,239.46/1,710.45 = 679.92/x
  3. Step 3: Cross multiply
    1,239.46x = 1,710.45 × 679.92
  4. Step 4: Simplify right side
    1,239.46x = 1,162,969.16
  5. Step 5: Solve for x
    x = 1,162,969.16/1,239.46
  6. Step 6: Final answer
    x = 938.29

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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.