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Finding the Fourth Proportional to 54.48, 74.16 and 54.18

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Solution

The fourth proportional to 54.48, 74.16 and 54.18 is: 73.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.48 : 74.16 = 54.18 : x
  2. Step 2: Convert to fraction form
    54.48/74.16 = 54.18/x
  3. Step 3: Cross multiply
    54.48x = 74.16 × 54.18
  4. Step 4: Simplify right side
    54.48x = 4,017.99
  5. Step 5: Solve for x
    x = 4,017.99/54.48
  6. Step 6: Final answer
    x = 73.75

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.