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Finding the Fourth Proportional to 120.51, 179.76 and 117.78

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Solution

The fourth proportional to 120.51, 179.76 and 117.78 is: 175.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.51 : 179.76 = 117.78 : x
  2. Step 2: Convert to fraction form
    120.51/179.76 = 117.78/x
  3. Step 3: Cross multiply
    120.51x = 179.76 × 117.78
  4. Step 4: Simplify right side
    120.51x = 21,172.13
  5. Step 5: Solve for x
    x = 21,172.13/120.51
  6. Step 6: Final answer
    x = 175.69

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.