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Finding the Fourth Proportional to 45, 67.80 and 37.56

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Solution

The fourth proportional to 45, 67.80 and 37.56 is: 56.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    45 : 67.80 = 37.56 : x
  2. Step 2: Convert to fraction form
    45/67.80 = 37.56/x
  3. Step 3: Cross multiply
    45x = 67.80 × 37.56
  4. Step 4: Simplify right side
    45x = 2,546.57
  5. Step 5: Solve for x
    x = 2,546.57/45
  6. Step 6: Final answer
    x = 56.59

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.