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Finding the Fourth Proportional to 359.18, 538.61 and 128.00

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Solution

The fourth proportional to 359.18, 538.61 and 128.00 is: 191.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    359.18 : 538.61 = 128.00 : x
  2. Step 2: Convert to fraction form
    359.18/538.61 = 128.00/x
  3. Step 3: Cross multiply
    359.18x = 538.61 × 128.00
  4. Step 4: Simplify right side
    359.18x = 68,939.71
  5. Step 5: Solve for x
    x = 68,939.71/359.18
  6. Step 6: Final answer
    x = 191.94

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.