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Finding the Fourth Proportional to 412.17, 617.69 and 320.45

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Solution

The fourth proportional to 412.17, 617.69 and 320.45 is: 480.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    412.17 : 617.69 = 320.45 : x
  2. Step 2: Convert to fraction form
    412.17/617.69 = 320.45/x
  3. Step 3: Cross multiply
    412.17x = 617.69 × 320.45
  4. Step 4: Simplify right side
    412.17x = 197,934.07
  5. Step 5: Solve for x
    x = 197,934.07/412.17
  6. Step 6: Final answer
    x = 480.22

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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.