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Finding the Fourth Proportional to 315.39, 472.89 and 193.68

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Solution

The fourth proportional to 315.39, 472.89 and 193.68 is: 290.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.39 : 472.89 = 193.68 : x
  2. Step 2: Convert to fraction form
    315.39/472.89 = 193.68/x
  3. Step 3: Cross multiply
    315.39x = 472.89 × 193.68
  4. Step 4: Simplify right side
    315.39x = 91,589.34
  5. Step 5: Solve for x
    x = 91,589.34/315.39
  6. Step 6: Final answer
    x = 290.40

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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.