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Finding the Fourth Proportional to 359.28, 538.96 and 128.16

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Solution

The fourth proportional to 359.28, 538.96 and 128.16 is: 192.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    359.28 : 538.96 = 128.16 : x
  2. Step 2: Convert to fraction form
    359.28/538.96 = 128.16/x
  3. Step 3: Cross multiply
    359.28x = 538.96 × 128.16
  4. Step 4: Simplify right side
    359.28x = 69,073.11
  5. Step 5: Solve for x
    x = 69,073.11/359.28
  6. Step 6: Final answer
    x = 192.25

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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.