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Finding the Fourth Proportional to 359.91, 539.76 and 128.77

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Solution

The fourth proportional to 359.91, 539.76 and 128.77 is: 193.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    359.91 : 539.76 = 128.77 : x
  2. Step 2: Convert to fraction form
    359.91/539.76 = 128.77/x
  3. Step 3: Cross multiply
    359.91x = 539.76 × 128.77
  4. Step 4: Simplify right side
    359.91x = 69,504.03
  5. Step 5: Solve for x
    x = 69,504.03/359.91
  6. Step 6: Final answer
    x = 193.12

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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.