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Finding the Fourth Proportional to 55.14, 83.18 and 51.81

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Solution

The fourth proportional to 55.14, 83.18 and 51.81 is: 78.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.14 : 83.18 = 51.81 : x
  2. Step 2: Convert to fraction form
    55.14/83.18 = 51.81/x
  3. Step 3: Cross multiply
    55.14x = 83.18 × 51.81
  4. Step 4: Simplify right side
    55.14x = 4,309.30
  5. Step 5: Solve for x
    x = 4,309.30/55.14
  6. Step 6: Final answer
    x = 78.15

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.