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Finding the Fourth Proportional to 253.20, 378.60 and 188.40

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Solution

The fourth proportional to 253.20, 378.60 and 188.40 is: 281.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.20 : 378.60 = 188.40 : x
  2. Step 2: Convert to fraction form
    253.20/378.60 = 188.40/x
  3. Step 3: Cross multiply
    253.20x = 378.60 × 188.40
  4. Step 4: Simplify right side
    253.20x = 71,328.24
  5. Step 5: Solve for x
    x = 71,328.24/253.20
  6. Step 6: Final answer
    x = 281.71

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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.