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Finding the Fourth Proportional to 352.54, 528.40 and 147.21

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Solution

The fourth proportional to 352.54, 528.40 and 147.21 is: 220.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    352.54 : 528.40 = 147.21 : x
  2. Step 2: Convert to fraction form
    352.54/528.40 = 147.21/x
  3. Step 3: Cross multiply
    352.54x = 528.40 × 147.21
  4. Step 4: Simplify right side
    352.54x = 77,785.76
  5. Step 5: Solve for x
    x = 77,785.76/352.54
  6. Step 6: Final answer
    x = 220.64

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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.