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Finding the Fourth Proportional to 275.05, 378.98 and 187.57

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Solution

The fourth proportional to 275.05, 378.98 and 187.57 is: 258.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    275.05 : 378.98 = 187.57 : x
  2. Step 2: Convert to fraction form
    275.05/378.98 = 187.57/x
  3. Step 3: Cross multiply
    275.05x = 378.98 × 187.57
  4. Step 4: Simplify right side
    275.05x = 71,084.34
  5. Step 5: Solve for x
    x = 71,084.34/275.05
  6. Step 6: Final answer
    x = 258.44

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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.