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Finding the Fourth Proportional to 359.15, 538.58 and 139.67

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Solution

The fourth proportional to 359.15, 538.58 and 139.67 is: 209.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    359.15 : 538.58 = 139.67 : x
  2. Step 2: Convert to fraction form
    359.15/538.58 = 139.67/x
  3. Step 3: Cross multiply
    359.15x = 538.58 × 139.67
  4. Step 4: Simplify right side
    359.15x = 75,220.08
  5. Step 5: Solve for x
    x = 75,220.08/359.15
  6. Step 6: Final answer
    x = 209.44

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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.