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Finding the Fourth Proportional to 315.07, 472.71 and 212.08

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Solution

The fourth proportional to 315.07, 472.71 and 212.08 is: 318.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.07 : 472.71 = 212.08 : x
  2. Step 2: Convert to fraction form
    315.07/472.71 = 212.08/x
  3. Step 3: Cross multiply
    315.07x = 472.71 × 212.08
  4. Step 4: Simplify right side
    315.07x = 100,252.34
  5. Step 5: Solve for x
    x = 100,252.34/315.07
  6. Step 6: Final answer
    x = 318.19

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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.