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Finding the Fourth Proportional to 472.02, 708.18 and 212.20

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Solution

The fourth proportional to 472.02, 708.18 and 212.20 is: 318.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    472.02 : 708.18 = 212.20 : x
  2. Step 2: Convert to fraction form
    472.02/708.18 = 212.20/x
  3. Step 3: Cross multiply
    472.02x = 708.18 × 212.20
  4. Step 4: Simplify right side
    472.02x = 150,275.80
  5. Step 5: Solve for x
    x = 150,275.80/472.02
  6. Step 6: Final answer
    x = 318.37

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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.