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Finding the Fourth Proportional to 431.33, 643.32 and 379.38

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Solution

The fourth proportional to 431.33, 643.32 and 379.38 is: 565.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.33 : 643.32 = 379.38 : x
  2. Step 2: Convert to fraction form
    431.33/643.32 = 379.38/x
  3. Step 3: Cross multiply
    431.33x = 643.32 × 379.38
  4. Step 4: Simplify right side
    431.33x = 244,062.74
  5. Step 5: Solve for x
    x = 244,062.74/431.33
  6. Step 6: Final answer
    x = 565.84

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.