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Finding the Fourth Proportional to 55.15, 75.54 and 54.79

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Solution

The fourth proportional to 55.15, 75.54 and 54.79 is: 75.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.15 : 75.54 = 54.79 : x
  2. Step 2: Convert to fraction form
    55.15/75.54 = 54.79/x
  3. Step 3: Cross multiply
    55.15x = 75.54 × 54.79
  4. Step 4: Simplify right side
    55.15x = 4,138.84
  5. Step 5: Solve for x
    x = 4,138.84/55.15
  6. Step 6: Final answer
    x = 75.05

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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.