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Finding the Fourth Proportional to 436.20, 654.22 and 143.72

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Solution

The fourth proportional to 436.20, 654.22 and 143.72 is: 215.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    436.20 : 654.22 = 143.72 : x
  2. Step 2: Convert to fraction form
    436.20/654.22 = 143.72/x
  3. Step 3: Cross multiply
    436.20x = 654.22 × 143.72
  4. Step 4: Simplify right side
    436.20x = 94,025.37
  5. Step 5: Solve for x
    x = 94,025.37/436.20
  6. Step 6: Final answer
    x = 215.55

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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.