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Finding the Fourth Proportional to 315.27, 472.21 and 193.16

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Solution

The fourth proportional to 315.27, 472.21 and 193.16 is: 289.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.27 : 472.21 = 193.16 : x
  2. Step 2: Convert to fraction form
    315.27/472.21 = 193.16/x
  3. Step 3: Cross multiply
    315.27x = 472.21 × 193.16
  4. Step 4: Simplify right side
    315.27x = 91,212.78
  5. Step 5: Solve for x
    x = 91,212.78/315.27
  6. Step 6: Final answer
    x = 289.32

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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.