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Finding the Fourth Proportional to 54.19, 74.81 and 42.57

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Solution

The fourth proportional to 54.19, 74.81 and 42.57 is: 58.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.19 : 74.81 = 42.57 : x
  2. Step 2: Convert to fraction form
    54.19/74.81 = 42.57/x
  3. Step 3: Cross multiply
    54.19x = 74.81 × 42.57
  4. Step 4: Simplify right side
    54.19x = 3,184.66
  5. Step 5: Solve for x
    x = 3,184.66/54.19
  6. Step 6: Final answer
    x = 58.77

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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.