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Finding the Fourth Proportional to 54.28, 75.12 and 48.56

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Solution

The fourth proportional to 54.28, 75.12 and 48.56 is: 67.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.28 : 75.12 = 48.56 : x
  2. Step 2: Convert to fraction form
    54.28/75.12 = 48.56/x
  3. Step 3: Cross multiply
    54.28x = 75.12 × 48.56
  4. Step 4: Simplify right side
    54.28x = 3,647.83
  5. Step 5: Solve for x
    x = 3,647.83/54.28
  6. Step 6: Final answer
    x = 67.20

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.