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Finding the Fourth Proportional to 55.05, 75.50 and 52.80

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Solution

The fourth proportional to 55.05, 75.50 and 52.80 is: 72.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.05 : 75.50 = 52.80 : x
  2. Step 2: Convert to fraction form
    55.05/75.50 = 52.80/x
  3. Step 3: Cross multiply
    55.05x = 75.50 × 52.80
  4. Step 4: Simplify right side
    55.05x = 3,986.14
  5. Step 5: Solve for x
    x = 3,986.14/55.05
  6. Step 6: Final answer
    x = 72.41

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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.