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Finding the Fourth Proportional to 359.10, 538.68 and 128.04

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Solution

The fourth proportional to 359.10, 538.68 and 128.04 is: 192.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    359.10 : 538.68 = 128.04 : x
  2. Step 2: Convert to fraction form
    359.10/538.68 = 128.04/x
  3. Step 3: Cross multiply
    359.10x = 538.68 × 128.04
  4. Step 4: Simplify right side
    359.10x = 68,972.59
  5. Step 5: Solve for x
    x = 68,972.59/359.10
  6. Step 6: Final answer
    x = 192.07

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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.