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Finding the Fourth Proportional to 388.69, 583.09 and 132.13

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Solution

The fourth proportional to 388.69, 583.09 and 132.13 is: 198.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.69 : 583.09 = 132.13 : x
  2. Step 2: Convert to fraction form
    388.69/583.09 = 132.13/x
  3. Step 3: Cross multiply
    388.69x = 583.09 × 132.13
  4. Step 4: Simplify right side
    388.69x = 77,043.68
  5. Step 5: Solve for x
    x = 77,043.68/388.69
  6. Step 6: Final answer
    x = 198.21

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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.