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Finding the Fourth Proportional to 259.26, 388.41 and 143.53

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Solution

The fourth proportional to 259.26, 388.41 and 143.53 is: 215.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.26 : 388.41 = 143.53 : x
  2. Step 2: Convert to fraction form
    259.26/388.41 = 143.53/x
  3. Step 3: Cross multiply
    259.26x = 388.41 × 143.53
  4. Step 4: Simplify right side
    259.26x = 55,748.49
  5. Step 5: Solve for x
    x = 55,748.49/259.26
  6. Step 6: Final answer
    x = 215.03

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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.