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Finding the Fourth Proportional to 358.80, 538.20 and 127.65

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Solution

The fourth proportional to 358.80, 538.20 and 127.65 is: 191.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    358.80 : 538.20 = 127.65 : x
  2. Step 2: Convert to fraction form
    358.80/538.20 = 127.65/x
  3. Step 3: Cross multiply
    358.80x = 538.20 × 127.65
  4. Step 4: Simplify right side
    358.80x = 68,701.23
  5. Step 5: Solve for x
    x = 68,701.23/358.80
  6. Step 6: Final answer
    x = 191.48

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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.