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Finding the Fourth Proportional to 336.80, 464.80 and 212.40

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Solution

The fourth proportional to 336.80, 464.80 and 212.40 is: 293.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    336.80 : 464.80 = 212.40 : x
  2. Step 2: Convert to fraction form
    336.80/464.80 = 212.40/x
  3. Step 3: Cross multiply
    336.80x = 464.80 × 212.40
  4. Step 4: Simplify right side
    336.80x = 98,723.52
  5. Step 5: Solve for x
    x = 98,723.52/336.80
  6. Step 6: Final answer
    x = 293.12

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.