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Finding the Fourth Proportional to 275.61, 380.21 and 187.10

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Solution

The fourth proportional to 275.61, 380.21 and 187.10 is: 258.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    275.61 : 380.21 = 187.10 : x
  2. Step 2: Convert to fraction form
    275.61/380.21 = 187.10/x
  3. Step 3: Cross multiply
    275.61x = 380.21 × 187.10
  4. Step 4: Simplify right side
    275.61x = 71,134.45
  5. Step 5: Solve for x
    x = 71,134.45/275.61
  6. Step 6: Final answer
    x = 258.10

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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.