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Finding the Fourth Proportional to 436.26, 651.66 and 428.16

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Solution

The fourth proportional to 436.26, 651.66 and 428.16 is: 639.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    436.26 : 651.66 = 428.16 : x
  2. Step 2: Convert to fraction form
    436.26/651.66 = 428.16/x
  3. Step 3: Cross multiply
    436.26x = 651.66 × 428.16
  4. Step 4: Simplify right side
    436.26x = 279,014.75
  5. Step 5: Solve for x
    x = 279,014.75/436.26
  6. Step 6: Final answer
    x = 639.56

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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.