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Finding the Fourth Proportional to 282.05, 389.21 and 157.72

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Solution

The fourth proportional to 282.05, 389.21 and 157.72 is: 217.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    282.05 : 389.21 = 157.72 : x
  2. Step 2: Convert to fraction form
    282.05/389.21 = 157.72/x
  3. Step 3: Cross multiply
    282.05x = 389.21 × 157.72
  4. Step 4: Simplify right side
    282.05x = 61,385.62
  5. Step 5: Solve for x
    x = 61,385.62/282.05
  6. Step 6: Final answer
    x = 217.64

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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.