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Finding the Fourth Proportional to 328.78, 453.68 and 188.90

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Solution

The fourth proportional to 328.78, 453.68 and 188.90 is: 260.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.78 : 453.68 = 188.90 : x
  2. Step 2: Convert to fraction form
    328.78/453.68 = 188.90/x
  3. Step 3: Cross multiply
    328.78x = 453.68 × 188.90
  4. Step 4: Simplify right side
    328.78x = 85,700.15
  5. Step 5: Solve for x
    x = 85,700.15/328.78
  6. Step 6: Final answer
    x = 260.66

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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.