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Finding the Fourth Proportional to 359.30, 538.76 and 128.18

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Solution

The fourth proportional to 359.30, 538.76 and 128.18 is: 192.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    359.30 : 538.76 = 128.18 : x
  2. Step 2: Convert to fraction form
    359.30/538.76 = 128.18/x
  3. Step 3: Cross multiply
    359.30x = 538.76 × 128.18
  4. Step 4: Simplify right side
    359.30x = 69,058.26
  5. Step 5: Solve for x
    x = 69,058.26/359.30
  6. Step 6: Final answer
    x = 192.20

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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.