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Finding the Fourth Proportional to 314.80, 472.20 and 212.16

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Solution

The fourth proportional to 314.80, 472.20 and 212.16 is: 318.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    314.80 : 472.20 = 212.16 : x
  2. Step 2: Convert to fraction form
    314.80/472.20 = 212.16/x
  3. Step 3: Cross multiply
    314.80x = 472.20 × 212.16
  4. Step 4: Simplify right side
    314.80x = 100,181.95
  5. Step 5: Solve for x
    x = 100,181.95/314.80
  6. Step 6: Final answer
    x = 318.24

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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.