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Finding the Fourth Proportional to 645.44, 969.23 and 612.58

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Solution

The fourth proportional to 645.44, 969.23 and 612.58 is: 919.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.44 : 969.23 = 612.58 : x
  2. Step 2: Convert to fraction form
    645.44/969.23 = 612.58/x
  3. Step 3: Cross multiply
    645.44x = 969.23 × 612.58
  4. Step 4: Simplify right side
    645.44x = 593,725.43
  5. Step 5: Solve for x
    x = 593,725.43/645.44
  6. Step 6: Final answer
    x = 919.87

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.