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Finding the Fourth Proportional to 259.32, 388.96 and 115.14

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Solution

The fourth proportional to 259.32, 388.96 and 115.14 is: 172.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.32 : 388.96 = 115.14 : x
  2. Step 2: Convert to fraction form
    259.32/388.96 = 115.14/x
  3. Step 3: Cross multiply
    259.32x = 388.96 × 115.14
  4. Step 4: Simplify right side
    259.32x = 44,784.85
  5. Step 5: Solve for x
    x = 44,784.85/259.32
  6. Step 6: Final answer
    x = 172.70

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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.