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Finding the Fourth Proportional to 436.92, 654.78 and 423.78

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Solution

The fourth proportional to 436.92, 654.78 and 423.78 is: 635.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    436.92 : 654.78 = 423.78 : x
  2. Step 2: Convert to fraction form
    436.92/654.78 = 423.78/x
  3. Step 3: Cross multiply
    436.92x = 654.78 × 423.78
  4. Step 4: Simplify right side
    436.92x = 277,482.67
  5. Step 5: Solve for x
    x = 277,482.67/436.92
  6. Step 6: Final answer
    x = 635.09

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.