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Finding the Fourth Proportional to 85.81, 118.50 and 76.76

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Solution

The fourth proportional to 85.81, 118.50 and 76.76 is: 106.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.81 : 118.50 = 76.76 : x
  2. Step 2: Convert to fraction form
    85.81/118.50 = 76.76/x
  3. Step 3: Cross multiply
    85.81x = 118.50 × 76.76
  4. Step 4: Simplify right side
    85.81x = 9,096.06
  5. Step 5: Solve for x
    x = 9,096.06/85.81
  6. Step 6: Final answer
    x = 106.00

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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.