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Finding the Fourth Proportional to 359.62, 539.51 and 128.53

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Solution

The fourth proportional to 359.62, 539.51 and 128.53 is: 192.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    359.62 : 539.51 = 128.53 : x
  2. Step 2: Convert to fraction form
    359.62/539.51 = 128.53/x
  3. Step 3: Cross multiply
    359.62x = 539.51 × 128.53
  4. Step 4: Simplify right side
    359.62x = 69,343.22
  5. Step 5: Solve for x
    x = 69,343.22/359.62
  6. Step 6: Final answer
    x = 192.82

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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.