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Finding the Fourth Proportional to 33.20, 45.78 and 31.40

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Solution

The fourth proportional to 33.20, 45.78 and 31.40 is: 43.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    33.20 : 45.78 = 31.40 : x
  2. Step 2: Convert to fraction form
    33.20/45.78 = 31.40/x
  3. Step 3: Cross multiply
    33.20x = 45.78 × 31.40
  4. Step 4: Simplify right side
    33.20x = 1,437.49
  5. Step 5: Solve for x
    x = 1,437.49/33.20
  6. Step 6: Final answer
    x = 43.30

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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.