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Finding the Fourth Proportional to 256.18, 383.75 and 191.25

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Solution

The fourth proportional to 256.18, 383.75 and 191.25 is: 286.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.18 : 383.75 = 191.25 : x
  2. Step 2: Convert to fraction form
    256.18/383.75 = 191.25/x
  3. Step 3: Cross multiply
    256.18x = 383.75 × 191.25
  4. Step 4: Simplify right side
    256.18x = 73,391.68
  5. Step 5: Solve for x
    x = 73,391.68/256.18
  6. Step 6: Final answer
    x = 286.49

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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.