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Finding the Fourth Proportional to 90.81, 135.55 and 83.58

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Solution

The fourth proportional to 90.81, 135.55 and 83.58 is: 124.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.81 : 135.55 = 83.58 : x
  2. Step 2: Convert to fraction form
    90.81/135.55 = 83.58/x
  3. Step 3: Cross multiply
    90.81x = 135.55 × 83.58
  4. Step 4: Simplify right side
    90.81x = 11,329.27
  5. Step 5: Solve for x
    x = 11,329.27/90.81
  6. Step 6: Final answer
    x = 124.76

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.