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Finding the Fourth Proportional to 282.19, 423.27 and 128.09

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Solution

The fourth proportional to 282.19, 423.27 and 128.09 is: 192.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    282.19 : 423.27 = 128.09 : x
  2. Step 2: Convert to fraction form
    282.19/423.27 = 128.09/x
  3. Step 3: Cross multiply
    282.19x = 423.27 × 128.09
  4. Step 4: Simplify right side
    282.19x = 54,214.54
  5. Step 5: Solve for x
    x = 54,214.54/282.19
  6. Step 6: Final answer
    x = 192.12

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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.