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Finding the Fourth Proportional to 328.64, 453.56 and 188.78

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Solution

The fourth proportional to 328.64, 453.56 and 188.78 is: 260.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.64 : 453.56 = 188.78 : x
  2. Step 2: Convert to fraction form
    328.64/453.56 = 188.78/x
  3. Step 3: Cross multiply
    328.64x = 453.56 × 188.78
  4. Step 4: Simplify right side
    328.64x = 85,619.85
  5. Step 5: Solve for x
    x = 85,619.85/328.64
  6. Step 6: Final answer
    x = 260.53

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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.