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Finding the Fourth Proportional to 54.03, 74.61 and 39.45

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Solution

The fourth proportional to 54.03, 74.61 and 39.45 is: 54.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.03 : 74.61 = 39.45 : x
  2. Step 2: Convert to fraction form
    54.03/74.61 = 39.45/x
  3. Step 3: Cross multiply
    54.03x = 74.61 × 39.45
  4. Step 4: Simplify right side
    54.03x = 2,943.36
  5. Step 5: Solve for x
    x = 2,943.36/54.03
  6. Step 6: Final answer
    x = 54.48

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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.