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Finding the Fourth Proportional to 55, 75.90 and 33.20

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Solution

The fourth proportional to 55, 75.90 and 33.20 is: 45.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    55 : 75.90 = 33.20 : x
  2. Step 2: Convert to fraction form
    55/75.90 = 33.20/x
  3. Step 3: Cross multiply
    55x = 75.90 × 33.20
  4. Step 4: Simplify right side
    55x = 2,519.88
  5. Step 5: Solve for x
    x = 2,519.88/55
  6. Step 6: Final answer
    x = 45.82

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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.