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Finding the Fourth Proportional to 134.51, 201.56 and 76.80

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Solution

The fourth proportional to 134.51, 201.56 and 76.80 is: 115.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    134.51 : 201.56 = 76.80 : x
  2. Step 2: Convert to fraction form
    134.51/201.56 = 76.80/x
  3. Step 3: Cross multiply
    134.51x = 201.56 × 76.80
  4. Step 4: Simplify right side
    134.51x = 15,479.05
  5. Step 5: Solve for x
    x = 15,479.05/134.51
  6. Step 6: Final answer
    x = 115.08

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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.