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Finding the Fourth Proportional to 387.92, 535.08 and 322.80

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Solution

The fourth proportional to 387.92, 535.08 and 322.80 is: 445.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.92 : 535.08 = 322.80 : x
  2. Step 2: Convert to fraction form
    387.92/535.08 = 322.80/x
  3. Step 3: Cross multiply
    387.92x = 535.08 × 322.80
  4. Step 4: Simplify right side
    387.92x = 172,723.82
  5. Step 5: Solve for x
    x = 172,723.82/387.92
  6. Step 6: Final answer
    x = 445.26

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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.