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Finding the Fourth Proportional to 315.09, 472.48 and 109.65

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Solution

The fourth proportional to 315.09, 472.48 and 109.65 is: 164.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.09 : 472.48 = 109.65 : x
  2. Step 2: Convert to fraction form
    315.09/472.48 = 109.65/x
  3. Step 3: Cross multiply
    315.09x = 472.48 × 109.65
  4. Step 4: Simplify right side
    315.09x = 51,809.55
  5. Step 5: Solve for x
    x = 51,809.55/315.09
  6. Step 6: Final answer
    x = 164.43

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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.