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Finding the Fourth Proportional to 968.67, 1,335.88 and 720.61

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Solution

The fourth proportional to 968.67, 1,335.88 and 720.61 is: 993.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    968.67 : 1,335.88 = 720.61 : x
  2. Step 2: Convert to fraction form
    968.67/1,335.88 = 720.61/x
  3. Step 3: Cross multiply
    968.67x = 1,335.88 × 720.61
  4. Step 4: Simplify right side
    968.67x = 962,648.49
  5. Step 5: Solve for x
    x = 962,648.49/968.67
  6. Step 6: Final answer
    x = 993.78

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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.