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Finding the Fourth Proportional to 282.69, 390.09 and 158.34

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Solution

The fourth proportional to 282.69, 390.09 and 158.34 is: 218.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    282.69 : 390.09 = 158.34 : x
  2. Step 2: Convert to fraction form
    282.69/390.09 = 158.34/x
  3. Step 3: Cross multiply
    282.69x = 390.09 × 158.34
  4. Step 4: Simplify right side
    282.69x = 61,766.85
  5. Step 5: Solve for x
    x = 61,766.85/282.69
  6. Step 6: Final answer
    x = 218.50

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.