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Finding the Fourth Proportional to 315.65, 472.92 and 193.55

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Solution

The fourth proportional to 315.65, 472.92 and 193.55 is: 289.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.65 : 472.92 = 193.55 : x
  2. Step 2: Convert to fraction form
    315.65/472.92 = 193.55/x
  3. Step 3: Cross multiply
    315.65x = 472.92 × 193.55
  4. Step 4: Simplify right side
    315.65x = 91,531.30
  5. Step 5: Solve for x
    x = 91,531.30/315.65
  6. Step 6: Final answer
    x = 289.98

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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.