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Finding the Fourth Proportional to 315.03, 472.28 and 272.21

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Solution

The fourth proportional to 315.03, 472.28 and 272.21 is: 408.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.03 : 472.28 = 272.21 : x
  2. Step 2: Convert to fraction form
    315.03/472.28 = 272.21/x
  3. Step 3: Cross multiply
    315.03x = 472.28 × 272.21
  4. Step 4: Simplify right side
    315.03x = 128,555.62
  5. Step 5: Solve for x
    x = 128,555.62/315.03
  6. Step 6: Final answer
    x = 408.07

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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.