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Finding the Fourth Proportional to 359.30, 538.95 and 142.88

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Solution

The fourth proportional to 359.30, 538.95 and 142.88 is: 214.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    359.30 : 538.95 = 142.88 : x
  2. Step 2: Convert to fraction form
    359.30/538.95 = 142.88/x
  3. Step 3: Cross multiply
    359.30x = 538.95 × 142.88
  4. Step 4: Simplify right side
    359.30x = 77,002.21
  5. Step 5: Solve for x
    x = 77,002.21/359.30
  6. Step 6: Final answer
    x = 214.31

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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.