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Finding the Fourth Proportional to 467.98, 645.91 and 320.81

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Solution

The fourth proportional to 467.98, 645.91 and 320.81 is: 442.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    467.98 : 645.91 = 320.81 : x
  2. Step 2: Convert to fraction form
    467.98/645.91 = 320.81/x
  3. Step 3: Cross multiply
    467.98x = 645.91 × 320.81
  4. Step 4: Simplify right side
    467.98x = 207,210.36
  5. Step 5: Solve for x
    x = 207,210.36/467.98
  6. Step 6: Final answer
    x = 442.78

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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.