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Finding the Fourth Proportional to 259.11, 388.53 and 112.80

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Solution

The fourth proportional to 259.11, 388.53 and 112.80 is: 169.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.11 : 388.53 = 112.80 : x
  2. Step 2: Convert to fraction form
    259.11/388.53 = 112.80/x
  3. Step 3: Cross multiply
    259.11x = 388.53 × 112.80
  4. Step 4: Simplify right side
    259.11x = 43,826.18
  5. Step 5: Solve for x
    x = 43,826.18/259.11
  6. Step 6: Final answer
    x = 169.14

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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.