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Finding the Fourth Proportional to 119.79, 179.54 and 90.81

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Solution

The fourth proportional to 119.79, 179.54 and 90.81 is: 136.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.79 : 179.54 = 90.81 : x
  2. Step 2: Convert to fraction form
    119.79/179.54 = 90.81/x
  3. Step 3: Cross multiply
    119.79x = 179.54 × 90.81
  4. Step 4: Simplify right side
    119.79x = 16,303.57
  5. Step 5: Solve for x
    x = 16,303.57/119.79
  6. Step 6: Final answer
    x = 136.10

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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.