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Finding the Fourth Proportional to 33.28, 45.65 and 30.40

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Solution

The fourth proportional to 33.28, 45.65 and 30.40 is: 41.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    33.28 : 45.65 = 30.40 : x
  2. Step 2: Convert to fraction form
    33.28/45.65 = 30.40/x
  3. Step 3: Cross multiply
    33.28x = 45.65 × 30.40
  4. Step 4: Simplify right side
    33.28x = 1,387.76
  5. Step 5: Solve for x
    x = 1,387.76/33.28
  6. Step 6: Final answer
    x = 41.70

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.