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Finding the Fourth Proportional to 969.67, 1,337.26 and 721.61

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Solution

The fourth proportional to 969.67, 1,337.26 and 721.61 is: 995.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    969.67 : 1,337.26 = 721.61 : x
  2. Step 2: Convert to fraction form
    969.67/1,337.26 = 721.61/x
  3. Step 3: Cross multiply
    969.67x = 1,337.26 × 721.61
  4. Step 4: Simplify right side
    969.67x = 964,980.19
  5. Step 5: Solve for x
    x = 964,980.19/969.67
  6. Step 6: Final answer
    x = 995.16

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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.