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Finding the Fourth Proportional to 81, 111.58 and 58.83

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Solution

The fourth proportional to 81, 111.58 and 58.83 is: 81.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    81 : 111.58 = 58.83 : x
  2. Step 2: Convert to fraction form
    81/111.58 = 58.83/x
  3. Step 3: Cross multiply
    81x = 111.58 × 58.83
  4. Step 4: Simplify right side
    81x = 6,563.69
  5. Step 5: Solve for x
    x = 6,563.69/81
  6. Step 6: Final answer
    x = 81.03

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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.