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Finding the Fourth Proportional to 968.40, 1,336.20 and 669.96

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Solution

The fourth proportional to 968.40, 1,336.20 and 669.96 is: 924.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    968.40 : 1,336.20 = 669.96 : x
  2. Step 2: Convert to fraction form
    968.40/1,336.20 = 669.96/x
  3. Step 3: Cross multiply
    968.40x = 1,336.20 × 669.96
  4. Step 4: Simplify right side
    968.40x = 895,200.55
  5. Step 5: Solve for x
    x = 895,200.55/968.40
  6. Step 6: Final answer
    x = 924.41

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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.