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Finding the Fourth Proportional to 645.26, 967.49 and 425.65

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Solution

The fourth proportional to 645.26, 967.49 and 425.65 is: 638.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.26 : 967.49 = 425.65 : x
  2. Step 2: Convert to fraction form
    645.26/967.49 = 425.65/x
  3. Step 3: Cross multiply
    645.26x = 967.49 × 425.65
  4. Step 4: Simplify right side
    645.26x = 411,809.99
  5. Step 5: Solve for x
    x = 411,809.99/645.26
  6. Step 6: Final answer
    x = 638.21

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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.