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Finding the Fourth Proportional to 147.56, 222.20 and 128.53

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Solution

The fourth proportional to 147.56, 222.20 and 128.53 is: 193.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.56 : 222.20 = 128.53 : x
  2. Step 2: Convert to fraction form
    147.56/222.20 = 128.53/x
  3. Step 3: Cross multiply
    147.56x = 222.20 × 128.53
  4. Step 4: Simplify right side
    147.56x = 28,558.69
  5. Step 5: Solve for x
    x = 28,558.69/147.56
  6. Step 6: Final answer
    x = 193.54

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.