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Finding the Fourth Proportional to 436.20, 651.24 and 431.64

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Solution

The fourth proportional to 436.20, 651.24 and 431.64 is: 644.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    436.20 : 651.24 = 431.64 : x
  2. Step 2: Convert to fraction form
    436.20/651.24 = 431.64/x
  3. Step 3: Cross multiply
    436.20x = 651.24 × 431.64
  4. Step 4: Simplify right side
    436.20x = 281,101.23
  5. Step 5: Solve for x
    x = 281,101.23/436.20
  6. Step 6: Final answer
    x = 644.43

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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.