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Finding the Fourth Proportional to 55.42, 76.49 and 30.87

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Solution

The fourth proportional to 55.42, 76.49 and 30.87 is: 42.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.42 : 76.49 = 30.87 : x
  2. Step 2: Convert to fraction form
    55.42/76.49 = 30.87/x
  3. Step 3: Cross multiply
    55.42x = 76.49 × 30.87
  4. Step 4: Simplify right side
    55.42x = 2,361.09
  5. Step 5: Solve for x
    x = 2,361.09/55.42
  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.