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Finding the Fourth Proportional to 55.18, 82.76 and 20.94

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Solution

The fourth proportional to 55.18, 82.76 and 20.94 is: 31.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.18 : 82.76 = 20.94 : x
  2. Step 2: Convert to fraction form
    55.18/82.76 = 20.94/x
  3. Step 3: Cross multiply
    55.18x = 82.76 × 20.94
  4. Step 4: Simplify right side
    55.18x = 1,732.79
  5. Step 5: Solve for x
    x = 1,732.79/55.18
  6. Step 6: Final answer
    x = 31.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.