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Finding the Fourth Proportional to 220.74, 328.40 and 212.10

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Solution

The fourth proportional to 220.74, 328.40 and 212.10 is: 315.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.74 : 328.40 = 212.10 : x
  2. Step 2: Convert to fraction form
    220.74/328.40 = 212.10/x
  3. Step 3: Cross multiply
    220.74x = 328.40 × 212.10
  4. Step 4: Simplify right side
    220.74x = 69,652.58
  5. Step 5: Solve for x
    x = 69,652.58/220.74
  6. Step 6: Final answer
    x = 315.54

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.