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Finding the Fourth Proportional to 275.45, 412.56 and 172.40

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Solution

The fourth proportional to 275.45, 412.56 and 172.40 is: 258.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    275.45 : 412.56 = 172.40 : x
  2. Step 2: Convert to fraction form
    275.45/412.56 = 172.40/x
  3. Step 3: Cross multiply
    275.45x = 412.56 × 172.40
  4. Step 4: Simplify right side
    275.45x = 71,123.28
  5. Step 5: Solve for x
    x = 71,123.28/275.45
  6. Step 6: Final answer
    x = 258.21

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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.