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Finding the Fourth Proportional to 969.64, 1,336.30 and 720.57

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Solution

The fourth proportional to 969.64, 1,336.30 and 720.57 is: 993.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    969.64 : 1,336.30 = 720.57 : x
  2. Step 2: Convert to fraction form
    969.64/1,336.30 = 720.57/x
  3. Step 3: Cross multiply
    969.64x = 1,336.30 × 720.57
  4. Step 4: Simplify right side
    969.64x = 962,897.69
  5. Step 5: Solve for x
    x = 962,897.69/969.64
  6. Step 6: Final answer
    x = 993.05

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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.