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Finding the Fourth Proportional to 282.96, 390.87 and 221.57

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Solution

The fourth proportional to 282.96, 390.87 and 221.57 is: 306.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    282.96 : 390.87 = 221.57 : x
  2. Step 2: Convert to fraction form
    282.96/390.87 = 221.57/x
  3. Step 3: Cross multiply
    282.96x = 390.87 × 221.57
  4. Step 4: Simplify right side
    282.96x = 86,603.11
  5. Step 5: Solve for x
    x = 86,603.11/282.96
  6. Step 6: Final answer
    x = 306.06

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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.