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Finding the Fourth Proportional to 275.25, 412.32 and 128.80

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Solution

The fourth proportional to 275.25, 412.32 and 128.80 is: 192.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    275.25 : 412.32 = 128.80 : x
  2. Step 2: Convert to fraction form
    275.25/412.32 = 128.80/x
  3. Step 3: Cross multiply
    275.25x = 412.32 × 128.80
  4. Step 4: Simplify right side
    275.25x = 53,106.11
  5. Step 5: Solve for x
    x = 53,106.11/275.25
  6. Step 6: Final answer
    x = 192.94

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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.