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Finding the Fourth Proportional to 645.69, 967.20 and 315.63

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Solution

The fourth proportional to 645.69, 967.20 and 315.63 is: 472.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.69 : 967.20 = 315.63 : x
  2. Step 2: Convert to fraction form
    645.69/967.20 = 315.63/x
  3. Step 3: Cross multiply
    645.69x = 967.20 × 315.63
  4. Step 4: Simplify right side
    645.69x = 305,279.78
  5. Step 5: Solve for x
    x = 305,279.78/645.69
  6. Step 6: Final answer
    x = 472.80

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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.