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Finding the Fourth Proportional to 968.80, 1,336.04 and 618.88

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Solution

The fourth proportional to 968.80, 1,336.04 and 618.88 is: 853.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    968.80 : 1,336.04 = 618.88 : x
  2. Step 2: Convert to fraction form
    968.80/1,336.04 = 618.88/x
  3. Step 3: Cross multiply
    968.80x = 1,336.04 × 618.88
  4. Step 4: Simplify right side
    968.80x = 826,848.44
  5. Step 5: Solve for x
    x = 826,848.44/968.80
  6. Step 6: Final answer
    x = 853.48

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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.