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Finding the Fourth Proportional to 315.54, 472.90 and 141.96

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Solution

The fourth proportional to 315.54, 472.90 and 141.96 is: 212.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.54 : 472.90 = 141.96 : x
  2. Step 2: Convert to fraction form
    315.54/472.90 = 141.96/x
  3. Step 3: Cross multiply
    315.54x = 472.90 × 141.96
  4. Step 4: Simplify right side
    315.54x = 67,132.88
  5. Step 5: Solve for x
    x = 67,132.88/315.54
  6. Step 6: Final answer
    x = 212.76

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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.