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Finding the Fourth Proportional to 282.15, 389.61 and 217.15

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Solution

The fourth proportional to 282.15, 389.61 and 217.15 is: 299.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    282.15 : 389.61 = 217.15 : x
  2. Step 2: Convert to fraction form
    282.15/389.61 = 217.15/x
  3. Step 3: Cross multiply
    282.15x = 389.61 × 217.15
  4. Step 4: Simplify right side
    282.15x = 84,602.84
  5. Step 5: Solve for x
    x = 84,602.84/282.15
  6. Step 6: Final answer
    x = 299.85

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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.