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Finding the Fourth Proportional to 54.12, 80.64 and 53.40

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Solution

The fourth proportional to 54.12, 80.64 and 53.40 is: 79.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.12 : 80.64 = 53.40 : x
  2. Step 2: Convert to fraction form
    54.12/80.64 = 53.40/x
  3. Step 3: Cross multiply
    54.12x = 80.64 × 53.40
  4. Step 4: Simplify right side
    54.12x = 4,306.18
  5. Step 5: Solve for x
    x = 4,306.18/54.12
  6. Step 6: Final answer
    x = 79.57

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.