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Finding the Fourth Proportional to 330.71, 456.15 and 212.72

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Solution

The fourth proportional to 330.71, 456.15 and 212.72 is: 293.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.71 : 456.15 = 212.72 : x
  2. Step 2: Convert to fraction form
    330.71/456.15 = 212.72/x
  3. Step 3: Cross multiply
    330.71x = 456.15 × 212.72
  4. Step 4: Simplify right side
    330.71x = 97,031.16
  5. Step 5: Solve for x
    x = 97,031.16/330.71
  6. Step 6: Final answer
    x = 293.40

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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.