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Finding the Fourth Proportional to 302.28, 453.28 and 128.92

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Solution

The fourth proportional to 302.28, 453.28 and 128.92 is: 193.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    302.28 : 453.28 = 128.92 : x
  2. Step 2: Convert to fraction form
    302.28/453.28 = 128.92/x
  3. Step 3: Cross multiply
    302.28x = 453.28 × 128.92
  4. Step 4: Simplify right side
    302.28x = 58,436.86
  5. Step 5: Solve for x
    x = 58,436.86/302.28
  6. Step 6: Final answer
    x = 193.32

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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.