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Finding the Fourth Proportional to 359.23, 538.87 and 128.18

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Solution

The fourth proportional to 359.23, 538.87 and 128.18 is: 192.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    359.23 : 538.87 = 128.18 : x
  2. Step 2: Convert to fraction form
    359.23/538.87 = 128.18/x
  3. Step 3: Cross multiply
    359.23x = 538.87 × 128.18
  4. Step 4: Simplify right side
    359.23x = 69,072.36
  5. Step 5: Solve for x
    x = 69,072.36/359.23
  6. Step 6: Final answer
    x = 192.28

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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.