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Finding the Fourth Proportional to 645.37, 968.40 and 320.74

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Solution

The fourth proportional to 645.37, 968.40 and 320.74 is: 481.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.37 : 968.40 = 320.74 : x
  2. Step 2: Convert to fraction form
    645.37/968.40 = 320.74/x
  3. Step 3: Cross multiply
    645.37x = 968.40 × 320.74
  4. Step 4: Simplify right side
    645.37x = 310,604.62
  5. Step 5: Solve for x
    x = 310,604.62/645.37
  6. Step 6: Final answer
    x = 481.28

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1.5x scale

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.