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Finding the Fourth Proportional to 256.85, 384.44 and 188.36

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Solution

The fourth proportional to 256.85, 384.44 and 188.36 is: 281.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.85 : 384.44 = 188.36 : x
  2. Step 2: Convert to fraction form
    256.85/384.44 = 188.36/x
  3. Step 3: Cross multiply
    256.85x = 384.44 × 188.36
  4. Step 4: Simplify right side
    256.85x = 72,413.11
  5. Step 5: Solve for x
    x = 72,413.11/256.85
  6. Step 6: Final answer
    x = 281.92

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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.