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Finding the Fourth Proportional to 959.94, 1,323.31 and 679.31

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Solution

The fourth proportional to 959.94, 1,323.31 and 679.31 is: 936.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.94 : 1,323.31 = 679.31 : x
  2. Step 2: Convert to fraction form
    959.94/1,323.31 = 679.31/x
  3. Step 3: Cross multiply
    959.94x = 1,323.31 × 679.31
  4. Step 4: Simplify right side
    959.94x = 898,937.72
  5. Step 5: Solve for x
    x = 898,937.72/959.94
  6. Step 6: Final answer
    x = 936.45

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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.