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Finding the Fourth Proportional to 472.81, 708.68 and 212.95

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Solution

The fourth proportional to 472.81, 708.68 and 212.95 is: 319.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    472.81 : 708.68 = 212.95 : x
  2. Step 2: Convert to fraction form
    472.81/708.68 = 212.95/x
  3. Step 3: Cross multiply
    472.81x = 708.68 × 212.95
  4. Step 4: Simplify right side
    472.81x = 150,913.41
  5. Step 5: Solve for x
    x = 150,913.41/472.81
  6. Step 6: Final answer
    x = 319.18

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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.