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Finding the Fourth Proportional to 310.56, 429.06 and 212.58

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Solution

The fourth proportional to 310.56, 429.06 and 212.58 is: 293.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.56 : 429.06 = 212.58 : x
  2. Step 2: Convert to fraction form
    310.56/429.06 = 212.58/x
  3. Step 3: Cross multiply
    310.56x = 429.06 × 212.58
  4. Step 4: Simplify right side
    310.56x = 91,209.57
  5. Step 5: Solve for x
    x = 91,209.57/310.56
  6. Step 6: Final answer
    x = 293.69

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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.