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Finding the Fourth Proportional to 54.19, 74.77 and 30.87

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Solution

The fourth proportional to 54.19, 74.77 and 30.87 is: 42.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.19 : 74.77 = 30.87 : x
  2. Step 2: Convert to fraction form
    54.19/74.77 = 30.87/x
  3. Step 3: Cross multiply
    54.19x = 74.77 × 30.87
  4. Step 4: Simplify right side
    54.19x = 2,308.46
  5. Step 5: Solve for x
    x = 2,308.46/54.19
  6. Step 6: Final answer
    x = 42.60

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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.