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Finding the Fourth Proportional to 436.28, 654.38 and 147.68

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Solution

The fourth proportional to 436.28, 654.38 and 147.68 is: 221.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    436.28 : 654.38 = 147.68 : x
  2. Step 2: Convert to fraction form
    436.28/654.38 = 147.68/x
  3. Step 3: Cross multiply
    436.28x = 654.38 × 147.68
  4. Step 4: Simplify right side
    436.28x = 96,638.84
  5. Step 5: Solve for x
    x = 96,638.84/436.28
  6. Step 6: Final answer
    x = 221.51

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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.