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Finding the Fourth Proportional to 363.19, 544.58 and 128.80

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Solution

The fourth proportional to 363.19, 544.58 and 128.80 is: 193.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    363.19 : 544.58 = 128.80 : x
  2. Step 2: Convert to fraction form
    363.19/544.58 = 128.80/x
  3. Step 3: Cross multiply
    363.19x = 544.58 × 128.80
  4. Step 4: Simplify right side
    363.19x = 70,141.26
  5. Step 5: Solve for x
    x = 70,141.26/363.19
  6. Step 6: Final answer
    x = 193.13

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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.