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Finding the Fourth Proportional to 959.40, 1,323.72 and 679.68

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Solution

The fourth proportional to 959.40, 1,323.72 and 679.68 is: 937.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.40 : 1,323.72 = 679.68 : x
  2. Step 2: Convert to fraction form
    959.40/1,323.72 = 679.68/x
  3. Step 3: Cross multiply
    959.40x = 1,323.72 × 679.68
  4. Step 4: Simplify right side
    959.40x = 899,706.01
  5. Step 5: Solve for x
    x = 899,706.01/959.40
  6. Step 6: Final answer
    x = 937.78

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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.