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Finding the Fourth Proportional to 259.20, 388.80 and 149.48

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Solution

The fourth proportional to 259.20, 388.80 and 149.48 is: 224.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.20 : 388.80 = 149.48 : x
  2. Step 2: Convert to fraction form
    259.20/388.80 = 149.48/x
  3. Step 3: Cross multiply
    259.20x = 388.80 × 149.48
  4. Step 4: Simplify right side
    259.20x = 58,117.82
  5. Step 5: Solve for x
    x = 58,117.82/259.20
  6. Step 6: Final answer
    x = 224.22

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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.