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Finding the Fourth Proportional to 969.08, 1,336.26 and 720.86

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Solution

The fourth proportional to 969.08, 1,336.26 and 720.86 is: 993.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    969.08 : 1,336.26 = 720.86 : x
  2. Step 2: Convert to fraction form
    969.08/1,336.26 = 720.86/x
  3. Step 3: Cross multiply
    969.08x = 1,336.26 × 720.86
  4. Step 4: Simplify right side
    969.08x = 963,256.38
  5. Step 5: Solve for x
    x = 963,256.38/969.08
  6. Step 6: Final answer
    x = 993.99

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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.