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Finding the Fourth Proportional to 315.29, 472.45 and 212.19

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Solution

The fourth proportional to 315.29, 472.45 and 212.19 is: 317.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.29 : 472.45 = 212.19 : x
  2. Step 2: Convert to fraction form
    315.29/472.45 = 212.19/x
  3. Step 3: Cross multiply
    315.29x = 472.45 × 212.19
  4. Step 4: Simplify right side
    315.29x = 100,248.64
  5. Step 5: Solve for x
    x = 100,248.64/315.29
  6. Step 6: Final answer
    x = 317.96

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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.