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Finding the Fourth Proportional to 315.72, 472.62 and 243.48

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Solution

The fourth proportional to 315.72, 472.62 and 243.48 is: 364.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.72 : 472.62 = 243.48 : x
  2. Step 2: Convert to fraction form
    315.72/472.62 = 243.48/x
  3. Step 3: Cross multiply
    315.72x = 472.62 × 243.48
  4. Step 4: Simplify right side
    315.72x = 115,073.52
  5. Step 5: Solve for x
    x = 115,073.52/315.72
  6. Step 6: Final answer
    x = 364.48

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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.