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Finding the Fourth Proportional to 282.79, 390.62 and 218.09

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Solution

The fourth proportional to 282.79, 390.62 and 218.09 is: 301.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    282.79 : 390.62 = 218.09 : x
  2. Step 2: Convert to fraction form
    282.79/390.62 = 218.09/x
  3. Step 3: Cross multiply
    282.79x = 390.62 × 218.09
  4. Step 4: Simplify right side
    282.79x = 85,190.32
  5. Step 5: Solve for x
    x = 85,190.32/282.79
  6. Step 6: Final answer
    x = 301.25

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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.