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Finding the Fourth Proportional to 275.57, 380.57 and 172.13

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Solution

The fourth proportional to 275.57, 380.57 and 172.13 is: 237.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    275.57 : 380.57 = 172.13 : x
  2. Step 2: Convert to fraction form
    275.57/380.57 = 172.13/x
  3. Step 3: Cross multiply
    275.57x = 380.57 × 172.13
  4. Step 4: Simplify right side
    275.57x = 65,506.04
  5. Step 5: Solve for x
    x = 65,506.04/275.57
  6. Step 6: Final answer
    x = 237.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.