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Finding the Fourth Proportional to 359.62, 539.47 and 128.45

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Solution

The fourth proportional to 359.62, 539.47 and 128.45 is: 192.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    359.62 : 539.47 = 128.45 : x
  2. Step 2: Convert to fraction form
    359.62/539.47 = 128.45/x
  3. Step 3: Cross multiply
    359.62x = 539.47 × 128.45
  4. Step 4: Simplify right side
    359.62x = 69,294.92
  5. Step 5: Solve for x
    x = 69,294.92/359.62
  6. Step 6: Final answer
    x = 192.69

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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.