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Finding the Fourth Proportional to 243.88, 366.04 and 128.40

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Solution

The fourth proportional to 243.88, 366.04 and 128.40 is: 192.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.88 : 366.04 = 128.40 : x
  2. Step 2: Convert to fraction form
    243.88/366.04 = 128.40/x
  3. Step 3: Cross multiply
    243.88x = 366.04 × 128.40
  4. Step 4: Simplify right side
    243.88x = 46,999.54
  5. Step 5: Solve for x
    x = 46,999.54/243.88
  6. Step 6: Final answer
    x = 192.72

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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.