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Finding the Fourth Proportional to 90.71, 135.90 and 76.37

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Solution

The fourth proportional to 90.71, 135.90 and 76.37 is: 114.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.71 : 135.90 = 76.37 : x
  2. Step 2: Convert to fraction form
    90.71/135.90 = 76.37/x
  3. Step 3: Cross multiply
    90.71x = 135.90 × 76.37
  4. Step 4: Simplify right side
    90.71x = 10,378.00
  5. Step 5: Solve for x
    x = 10,378.00/90.71
  6. Step 6: Final answer
    x = 114.41

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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.