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Finding the Fourth Proportional to 645.53, 968.79 and 321.17

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Solution

The fourth proportional to 645.53, 968.79 and 321.17 is: 482.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.53 : 968.79 = 321.17 : x
  2. Step 2: Convert to fraction form
    645.53/968.79 = 321.17/x
  3. Step 3: Cross multiply
    645.53x = 968.79 × 321.17
  4. Step 4: Simplify right side
    645.53x = 311,146.28
  5. Step 5: Solve for x
    x = 311,146.28/645.53
  6. Step 6: Final answer
    x = 482.00

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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.