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Finding the Fourth Proportional to 134.36, 185.40 and 90.76

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Solution

The fourth proportional to 134.36, 185.40 and 90.76 is: 125.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    134.36 : 185.40 = 90.76 : x
  2. Step 2: Convert to fraction form
    134.36/185.40 = 90.76/x
  3. Step 3: Cross multiply
    134.36x = 185.40 × 90.76
  4. Step 4: Simplify right side
    134.36x = 16,826.90
  5. Step 5: Solve for x
    x = 16,826.90/134.36
  6. Step 6: Final answer
    x = 125.24

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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.