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Finding the Fourth Proportional to 220.55, 330.84 and 74.30

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Solution

The fourth proportional to 220.55, 330.84 and 74.30 is: 111.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.55 : 330.84 = 74.30 : x
  2. Step 2: Convert to fraction form
    220.55/330.84 = 74.30/x
  3. Step 3: Cross multiply
    220.55x = 330.84 × 74.30
  4. Step 4: Simplify right side
    220.55x = 24,579.76
  5. Step 5: Solve for x
    x = 24,579.76/220.55
  6. Step 6: Final answer
    x = 111.45

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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.