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Finding the Fourth Proportional to 187.20, 257.94 and 155.95

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Solution

The fourth proportional to 187.20, 257.94 and 155.95 is: 214.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.20 : 257.94 = 155.95 : x
  2. Step 2: Convert to fraction form
    187.20/257.94 = 155.95/x
  3. Step 3: Cross multiply
    187.20x = 257.94 × 155.95
  4. Step 4: Simplify right side
    187.20x = 40,225.10
  5. Step 5: Solve for x
    x = 40,225.10/187.20
  6. Step 6: Final answer
    x = 214.88

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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.