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Finding the Fourth Proportional to 359.28, 538.80 and 215.28

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Solution

The fourth proportional to 359.28, 538.80 and 215.28 is: 322.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    359.28 : 538.80 = 215.28 : x
  2. Step 2: Convert to fraction form
    359.28/538.80 = 215.28/x
  3. Step 3: Cross multiply
    359.28x = 538.80 × 215.28
  4. Step 4: Simplify right side
    359.28x = 115,992.86
  5. Step 5: Solve for x
    x = 115,992.86/359.28
  6. Step 6: Final answer
    x = 322.85

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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.