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Finding the Fourth Proportional to 432.38, 643.36 and 430.94

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Solution

The fourth proportional to 432.38, 643.36 and 430.94 is: 641.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    432.38 : 643.36 = 430.94 : x
  2. Step 2: Convert to fraction form
    432.38/643.36 = 430.94/x
  3. Step 3: Cross multiply
    432.38x = 643.36 × 430.94
  4. Step 4: Simplify right side
    432.38x = 277,249.56
  5. Step 5: Solve for x
    x = 277,249.56/432.38
  6. Step 6: Final answer
    x = 641.22

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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.