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Finding the Fourth Proportional to 359.42, 539.21 and 128.32

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Solution

The fourth proportional to 359.42, 539.21 and 128.32 is: 192.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    359.42 : 539.21 = 128.32 : x
  2. Step 2: Convert to fraction form
    359.42/539.21 = 128.32/x
  3. Step 3: Cross multiply
    359.42x = 539.21 × 128.32
  4. Step 4: Simplify right side
    359.42x = 69,189.44
  5. Step 5: Solve for x
    x = 69,189.44/359.42
  6. Step 6: Final answer
    x = 192.50

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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.