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Finding the Fourth Proportional to 315.85, 434.67 and 272.11

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Solution

The fourth proportional to 315.85, 434.67 and 272.11 is: 374.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.85 : 434.67 = 272.11 : x
  2. Step 2: Convert to fraction form
    315.85/434.67 = 272.11/x
  3. Step 3: Cross multiply
    315.85x = 434.67 × 272.11
  4. Step 4: Simplify right side
    315.85x = 118,278.05
  5. Step 5: Solve for x
    x = 118,278.05/315.85
  6. Step 6: Final answer
    x = 374.48

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.