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Finding the Fourth Proportional to 54.02, 74.44 and 47.20

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Solution

The fourth proportional to 54.02, 74.44 and 47.20 is: 65.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.02 : 74.44 = 47.20 : x
  2. Step 2: Convert to fraction form
    54.02/74.44 = 47.20/x
  3. Step 3: Cross multiply
    54.02x = 74.44 × 47.20
  4. Step 4: Simplify right side
    54.02x = 3,513.57
  5. Step 5: Solve for x
    x = 3,513.57/54.02
  6. Step 6: Final answer
    x = 65.04

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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.