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Finding the Fourth Proportional to 119.68, 163.70 and 117.80

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Solution

The fourth proportional to 119.68, 163.70 and 117.80 is: 161.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.68 : 163.70 = 117.80 : x
  2. Step 2: Convert to fraction form
    119.68/163.70 = 117.80/x
  3. Step 3: Cross multiply
    119.68x = 163.70 × 117.80
  4. Step 4: Simplify right side
    119.68x = 19,283.86
  5. Step 5: Solve for x
    x = 19,283.86/119.68
  6. Step 6: Final answer
    x = 161.13

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.