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Finding the Fourth Proportional to 352.63, 528.93 and 147.21

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Solution

The fourth proportional to 352.63, 528.93 and 147.21 is: 220.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    352.63 : 528.93 = 147.21 : x
  2. Step 2: Convert to fraction form
    352.63/528.93 = 147.21/x
  3. Step 3: Cross multiply
    352.63x = 528.93 × 147.21
  4. Step 4: Simplify right side
    352.63x = 77,863.79
  5. Step 5: Solve for x
    x = 77,863.79/352.63
  6. Step 6: Final answer
    x = 220.81

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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.