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Finding the Fourth Proportional to 472.47, 708.66 and 212.48

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Solution

The fourth proportional to 472.47, 708.66 and 212.48 is: 318.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    472.47 : 708.66 = 212.48 : x
  2. Step 2: Convert to fraction form
    472.47/708.66 = 212.48/x
  3. Step 3: Cross multiply
    472.47x = 708.66 × 212.48
  4. Step 4: Simplify right side
    472.47x = 150,576.08
  5. Step 5: Solve for x
    x = 150,576.08/472.47
  6. Step 6: Final answer
    x = 318.70

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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.