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Finding the Fourth Proportional to 130.39, 180.13 and 120.67

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Solution

The fourth proportional to 130.39, 180.13 and 120.67 is: 166.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.39 : 180.13 = 120.67 : x
  2. Step 2: Convert to fraction form
    130.39/180.13 = 120.67/x
  3. Step 3: Cross multiply
    130.39x = 180.13 × 120.67
  4. Step 4: Simplify right side
    130.39x = 21,736.29
  5. Step 5: Solve for x
    x = 21,736.29/130.39
  6. Step 6: Final answer
    x = 166.70

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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.