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Finding the Fourth Proportional to 259.23, 388.82 and 74.15

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Solution

The fourth proportional to 259.23, 388.82 and 74.15 is: 111.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.23 : 388.82 = 74.15 : x
  2. Step 2: Convert to fraction form
    259.23/388.82 = 74.15/x
  3. Step 3: Cross multiply
    259.23x = 388.82 × 74.15
  4. Step 4: Simplify right side
    259.23x = 28,828.97
  5. Step 5: Solve for x
    x = 28,828.97/259.23
  6. Step 6: Final answer
    x = 111.21

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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.