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Finding the Fourth Proportional to 259.55, 388.66 and 143.87

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Solution

The fourth proportional to 259.55, 388.66 and 143.87 is: 215.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.55 : 388.66 = 143.87 : x
  2. Step 2: Convert to fraction form
    259.55/388.66 = 143.87/x
  3. Step 3: Cross multiply
    259.55x = 388.66 × 143.87
  4. Step 4: Simplify right side
    259.55x = 55,914.57
  5. Step 5: Solve for x
    x = 55,914.57/259.55
  6. Step 6: Final answer
    x = 215.43

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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.