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Finding the Fourth Proportional to 436.05, 654.66 and 428.76

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Solution

The fourth proportional to 436.05, 654.66 and 428.76 is: 643.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    436.05 : 654.66 = 428.76 : x
  2. Step 2: Convert to fraction form
    436.05/654.66 = 428.76/x
  3. Step 3: Cross multiply
    436.05x = 654.66 × 428.76
  4. Step 4: Simplify right side
    436.05x = 280,692.02
  5. Step 5: Solve for x
    x = 280,692.02/436.05
  6. Step 6: Final answer
    x = 643.72

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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.