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Finding the Fourth Proportional to 54.15, 74.17 and 53.79

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Solution

The fourth proportional to 54.15, 74.17 and 53.79 is: 73.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.15 : 74.17 = 53.79 : x
  2. Step 2: Convert to fraction form
    54.15/74.17 = 53.79/x
  3. Step 3: Cross multiply
    54.15x = 74.17 × 53.79
  4. Step 4: Simplify right side
    54.15x = 3,989.47
  5. Step 5: Solve for x
    x = 3,989.47/54.15
  6. Step 6: Final answer
    x = 73.67

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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.